Five times a number is divided by 7 more than that number. If the result is -8, then what was the original number?
Let the original number be called x. We can rewrite the original problem as:
(five times a number) is divided by (7 more than that number) = -8
5x/(x + 7) = -8
5x = -8(x + 7)
5x = -8x - 56
13x = -56
x = -56/13