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