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2(5m+1)=42
We move all terms to the left:
2(5m+1)-(42)=0
We multiply parentheses
10m+2-42=0
We add all the numbers together, and all the variables
10m-40=0
We move all terms containing m to the left, all other terms to the right
10m=40
m=40/10
m=4
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