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9m-8=-4m+31
We move all terms to the left:
9m-8-(-4m+31)=0
We get rid of parentheses
9m+4m-31-8=0
We add all the numbers together, and all the variables
13m-39=0
We move all terms containing m to the left, all other terms to the right
13m=39
m=39/13
m=3
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