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86=-5m+7
We move all terms to the left:
86-(-5m+7)=0
We get rid of parentheses
5m-7+86=0
We add all the numbers together, and all the variables
5m+79=0
We move all terms containing m to the left, all other terms to the right
5m=-79
m=-79/5
m=-15+4/5
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