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8160=3120+80m
We move all terms to the left:
8160-(3120+80m)=0
We add all the numbers together, and all the variables
-(80m+3120)+8160=0
We get rid of parentheses
-80m-3120+8160=0
We add all the numbers together, and all the variables
-80m+5040=0
We move all terms containing m to the left, all other terms to the right
-80m=-5040
m=-5040/-80
m=+63
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