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-6m-7(m+5)=21-5m
We move all terms to the left:
-6m-7(m+5)-(21-5m)=0
We add all the numbers together, and all the variables
-6m-7(m+5)-(-5m+21)=0
We multiply parentheses
-6m-7m-(-5m+21)-35=0
We get rid of parentheses
-6m-7m+5m-21-35=0
We add all the numbers together, and all the variables
-8m-56=0
We move all terms containing m to the left, all other terms to the right
-8m=56
m=56/-8
m=-7
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