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-5m+9(-m+7)=21
We move all terms to the left:
-5m+9(-m+7)-(21)=0
We add all the numbers together, and all the variables
-5m+9(-1m+7)-21=0
We multiply parentheses
-5m-9m+63-21=0
We add all the numbers together, and all the variables
-14m+42=0
We move all terms containing m to the left, all other terms to the right
-14m=-42
m=-42/-14
m=+3
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