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9m+15=6m-9
We move all terms to the left:
9m+15-(6m-9)=0
We get rid of parentheses
9m-6m+9+15=0
We add all the numbers together, and all the variables
3m+24=0
We move all terms containing m to the left, all other terms to the right
3m=-24
m=-24/3
m=-8
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