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-91=5m+9
We move all terms to the left:
-91-(5m+9)=0
We get rid of parentheses
-5m-9-91=0
We add all the numbers together, and all the variables
-5m-100=0
We move all terms containing m to the left, all other terms to the right
-5m=100
m=100/-5
m=-20
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