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-87=-9+6m
We move all terms to the left:
-87-(-9+6m)=0
We add all the numbers together, and all the variables
-(6m-9)-87=0
We get rid of parentheses
-6m+9-87=0
We add all the numbers together, and all the variables
-6m-78=0
We move all terms containing m to the left, all other terms to the right
-6m=78
m=78/-6
m=-13
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