Question

4m + 9 + 5m - 12 = 42

Answer 1

4m+9+5m-12=42 is 5. m= 5.

Answer 2

First, combine like terms.

4m+5m = 9m

9m + 9 - 12 = 42

9-12= -3

9m - 3 = 42

Second, apply the inverse operation to isolate the variable.

9m - 3 = 42
      +3     +3

9m = 45

Third, divide 9 by both sides to solve for m.

$\frac{9m}{9} = \frac{45}{9}$

m = 45/9

m = 5

Answer:  $m = 5$