Question

Twice the sum of a number x and 9 is equal to 12 less than the number x.  What is the value of x?

Answer 1

x = -30

Explanation:

Let x be the number.

2(x + 9) = x - 12

Use distributive property of multiplication

2x + 18 = x - 12

Simplify by combining like terms

2x - x = -12 - 18

x = -30