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12=m/8+3
We move all terms to the left:
12-(m/8+3)=0
We get rid of parentheses
-m/8-3+12=0
We multiply all the terms by the denominator
-m-3*8+12*8=0
We add all the numbers together, and all the variables
-1m+72=0
We move all terms containing m to the left, all other terms to the right
-m=-72
m=-72/-1
m=+72
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