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89=-1-9m
We move all terms to the left:
89-(-1-9m)=0
We add all the numbers together, and all the variables
-(-9m-1)+89=0
We get rid of parentheses
9m+1+89=0
We add all the numbers together, and all the variables
9m+90=0
We move all terms containing m to the left, all other terms to the right
9m=-90
m=-90/9
m=-10
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