LESSON 4: Ready to solve the equation      
Introduction to Elementary Algebra
Help on solving algebra math problems
Simple step by step method
We are now ready to start solving the equation below.
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Solving means to know the value for 'x'.

We know the value of 'x' when we can say: 'x' is equal to …



Or         
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the left side of the equal sign.


Most important rule: Because both sides of an equation are EQUAL,
any operation we do on one side must be done on the other side.


So let’s start
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We already got an x of the left side. But we don’t want the x on the right side.
What can we do?


We know from the previous lesson
that we can make the +2x disappear
if we use
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On the right side of the equation.
Because it is the
opposite operation.

But remember: to keep things legal we must do the same thing on the
left side also.


Let’s do it
On the right side of the equal sign
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                                                  Is equal to zero.



The equation becomes
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On the left side we can put the 'x's together like this
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It’s easy to see that
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Now the equation becomes
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Which is the same as
because
This is where we are now
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If we can make the -4 disappear we finally get the x alone on the left side of the
equal sign and we can say that we solved the equation.

The opposite of -4 is +4 so let’s do it on
BOTH sides.
Solving Algebra Mathematics problems the easy way
On the left side: -4 + 4 is equal to zero.


           
On the right side: 7 + 4 is equal to 11.


      or
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Congratulations!

The equation is solved !

If we use 11 in place of 'x' we will get that both sides of the equation are EQUAL.
In rapid motion...
Bye for now. More answers to algebra problems examples in a few days.
3x - 4 - 2x = 7 + 2x - 2x
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Mathematical Algebra
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Introduction to Elementary Algebra. Help on solving algebra math problems. Simple step by step method
Introduction to Elementary Algebra. Easy Elementary algebra lessons are meant to teach equations in the simplest way.
Introdução à Algebra - Matemática Ajuda na resolução de problemas matemáticos de Algebra Simples método com explicações passo a passo
Introdução à Algebra - Matemática. Estas lições de algebra elementar têm como objectivo o ensino simplificado e eficiente da resolução de equações.
Lesson 1: Things you should know before starting

Lesson 2: What does ‘equation’ mean?

Lesson 3: Our main goal: The 'x' by its own

Lesson 4: Ready to solve the equation

Lesson 5: Solved algebra examples 1

Lesson 6: Solved algebra equations 2