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

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

Or 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 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 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 Is equal to zero.

The equation becomes On the left side we can put the 'x's together like this It’s easy to see that Now the equation becomes   Which is the same as
because
This is where we are now 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. On the left side: -4 + 4 is equal to zero.

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

or 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