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