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8m+15=5m+42
We move all terms to the left:
8m+15-(5m+42)=0
We get rid of parentheses
8m-5m-42+15=0
We add all the numbers together, and all the variables
3m-27=0
We move all terms containing m to the left, all other terms to the right
3m=27
m=27/3
m=9
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