Question

13 + m/3 = 10 solve?

Answer 1

multiply each term by 3:-

39 + m = 30

subtract 39 from both sides
m = 30-39

m = -9

Answer 2

13 + m/3 = 10
m/3 = 10 - 13
m/3 = -3
m = -3(3)
m = -9