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-4m-3(2m-7)=91
We move all terms to the left:
-4m-3(2m-7)-(91)=0
We multiply parentheses
-4m-6m+21-91=0
We add all the numbers together, and all the variables
-10m-70=0
We move all terms containing m to the left, all other terms to the right
-10m=70
m=70/-10
m=-7
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