Question

The sum of -4 and 8 times a number is multiplied by 3. The result is 15 less that 25 times the number. What is the number?

A) -12
B) 6/7
C) 0
D) 3
E) none of the above

Answer 1

3(-4 + 8x) = 25x - 15
-12 + 24x = 25x - 15
25x - 24x = -12 + 15
 x = 3

answer is
D) 3