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86=13m-70
We move all terms to the left:
86-(13m-70)=0
We get rid of parentheses
-13m+70+86=0
We add all the numbers together, and all the variables
-13m+156=0
We move all terms containing m to the left, all other terms to the right
-13m=-156
m=-156/-13
m=+12
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