Question

For which value of x is the equation 3(3 + x) = 15 + x true?

A) 1
B) 2
C) 3
D) 4

Answer 1

The answer would be 3, since if 3(3 + x) is 18 then 15 + 3 would be 18 too.

Answer 2

Explanation:

3(3 + x) = 15 + x

3*3 + 3x = 15 +x

9 + 3x = 15 +x

3x - x = 15 - 9

2x = 6

x = 6/2

x = 3