# How do you solve #3x+7=31#?

##### 1 Answer

Aug 1, 2015

Subtract

#### Explanation:

With the exception of attempting to divide by zero, if you perform the same basic arithmetic operation (addition, subtraction, multiplication, division) to all terms on both sides of an equation using the same value, the equation remains valid.

So, given

We can subtract

and the new versions of equation are still valid.

Similarly, we can divide both sides of the last version by

isolating

and the result is still valid (again).