How do i find the value of a variable?

To find the value of a variable you must know the basics of pre-Algebra.

Example:

2x+9=39

To find he answer of this you must subtract 9 from both sides

Then you are left with ...

2x=30

Since 2x=30 means 2 times x equals 30

You can divide 2 from both sides to find the answer

Which is ...

x=15