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2m+7(-3m-4)=86
We move all terms to the left:
2m+7(-3m-4)-(86)=0
We multiply parentheses
2m-21m-28-86=0
We add all the numbers together, and all the variables
-19m-114=0
We move all terms containing m to the left, all other terms to the right
-19m=114
m=114/-19
m=-6
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