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12=m*9
We move all terms to the left:
12-(m*9)=0
We add all the numbers together, and all the variables
-(+m*9)+12=0
We get rid of parentheses
-m*9+12=0
Wy multiply elements
-9m+12=0
We move all terms containing m to the left, all other terms to the right
-9m=-12
m=-12/-9
m=1+1/3
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