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-15=8m+7
We move all terms to the left:
-15-(8m+7)=0
We get rid of parentheses
-8m-7-15=0
We add all the numbers together, and all the variables
-8m-22=0
We move all terms containing m to the left, all other terms to the right
-8m=22
m=22/-8
m=-2+3/4
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