Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 91: 19

m=126

We need to get the m alone, so we cancel out the addition by subtracting 5 on both sides. This leaves us with the equation $21=m/6$. We cancel out division using multiplication, so we multiply both sides by 6 to get that m=126. We plug 126 in for m and confirm that our answer is, indeed, correct.