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2(3+4m)=42
We move all terms to the left:
2(3+4m)-(42)=0
We add all the numbers together, and all the variables
2(4m+3)-42=0
We multiply parentheses
8m+6-42=0
We add all the numbers together, and all the variables
8m-36=0
We move all terms containing m to the left, all other terms to the right
8m=36
m=36/8
m=4+1/2
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