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-9m-20=18-5m+18
We move all terms to the left:
-9m-20-(18-5m+18)=0
We add all the numbers together, and all the variables
-9m-(-5m+36)-20=0
We get rid of parentheses
-9m+5m-36-20=0
We add all the numbers together, and all the variables
-4m-56=0
We move all terms containing m to the left, all other terms to the right
-4m=56
m=56/-4
m=-14
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