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9m=13-15
We move all terms to the left:
9m-(13-15)=0
We add all the numbers together, and all the variables
9m-(-2)=0
We add all the numbers together, and all the variables
9m+2=0
We move all terms containing m to the left, all other terms to the right
9m=-2
m=-2/9
m=-2/9
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