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-5m=-2m-9
We move all terms to the left:
-5m-(-2m-9)=0
We get rid of parentheses
-5m+2m+9=0
We add all the numbers together, and all the variables
-3m+9=0
We move all terms containing m to the left, all other terms to the right
-3m=-9
m=-9/-3
m=+3
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