Question

Justine evaluated this expression for a certain value of s and got 13. What was the value of s?

15 + s / 3 - 6

Answer 1

15+s / 3-6 simplify to 15+s / -3
Set that equal to 13 because it's the solution.
15+s / -3 = 13
Multiply both sides by -3.
15+s = -39
Subtract 15.
s = -54