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15=-3m-6-9
We move all terms to the left:
15-(-3m-6-9)=0
We add all the numbers together, and all the variables
-(-3m-15)+15=0
We get rid of parentheses
3m+15+15=0
We add all the numbers together, and all the variables
3m+30=0
We move all terms containing m to the left, all other terms to the right
3m=-30
m=-30/3
m=-10
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