Answer:
m = -10
Step-by-step explanation:
5m-7 = 3(2m+1) distribute multiplication by 3 over the addition 2m+1
5m-7 = 3·2m+3·1
5m-7 = 6m+3, subtract 5m and 3 from both sides of equal sign
5m-5m-7-3 = 6m -5m +3-3
-7-3 = 6m -5m combine like terms
-10 = m
