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12(3+m)=84
We move all terms to the left:
12(3+m)-(84)=0
We add all the numbers together, and all the variables
12(m+3)-84=0
We multiply parentheses
12m+36-84=0
We add all the numbers together, and all the variables
12m-48=0
We move all terms containing m to the left, all other terms to the right
12m=48
m=48/12
m=4
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