Question

Solve the following equation to find the value of x: 9x - 2 = 2x + 12

a)x = 2
b) x = 1
c) x = -2
d) x = 10/7

Answer 1

The answer is A.

Explanation:

First, you have to add 2 to both sides, to get rid of the -2 on the left side :

`9x - 2 = 2x + 12`

`9x - 2 + 2 = 2x + 12 + 2`

`9x = 2x + 14`

Next, you have to subtract 2x to both sides, to make all the x terms to one side and then, solve it :

`9x - 2x = 2x + 14 - 2x`

`7x = 14`

`x = 14 / 7`

`x = 2`