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91=2m+31
We move all terms to the left:
91-(2m+31)=0
We get rid of parentheses
-2m-31+91=0
We add all the numbers together, and all the variables
-2m+60=0
We move all terms containing m to the left, all other terms to the right
-2m=-60
m=-60/-2
m=+30
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