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-80=-9m+1
We move all terms to the left:
-80-(-9m+1)=0
We get rid of parentheses
9m-1-80=0
We add all the numbers together, and all the variables
9m-81=0
We move all terms containing m to the left, all other terms to the right
9m=81
m=81/9
m=9
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