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8m+7=4m-1
We move all terms to the left:
8m+7-(4m-1)=0
We get rid of parentheses
8m-4m+1+7=0
We add all the numbers together, and all the variables
4m+8=0
We move all terms containing m to the left, all other terms to the right
4m=-8
m=-8/4
m=-2
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