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3(1+4m)=87
We move all terms to the left:
3(1+4m)-(87)=0
We add all the numbers together, and all the variables
3(4m+1)-87=0
We multiply parentheses
12m+3-87=0
We add all the numbers together, and all the variables
12m-84=0
We move all terms containing m to the left, all other terms to the right
12m=84
m=84/12
m=7
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