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8m+7=5m+5=90
We move all terms to the left:
8m+7-(5m+5)=0
We get rid of parentheses
8m-5m-5+7=0
We add all the numbers together, and all the variables
3m+2=0
We move all terms containing m to the left, all other terms to the right
3m=-2
m=-2/3
m=-2/3
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