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3m+7(2m+3)=4
We move all terms to the left:
3m+7(2m+3)-(4)=0
We multiply parentheses
3m+14m+21-4=0
We add all the numbers together, and all the variables
17m+17=0
We move all terms containing m to the left, all other terms to the right
17m=-17
m=-17/17
m=-1
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