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5m-7=2m+8
We move all terms to the left:
5m-7-(2m+8)=0
We get rid of parentheses
5m-2m-8-7=0
We add all the numbers together, and all the variables
3m-15=0
We move all terms containing m to the left, all other terms to the right
3m=15
m=15/3
m=5
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