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6=m.3-9
We move all terms to the left:
6-(m.3-9)=0
We get rid of parentheses
-m.3+9+6=0
We add all the numbers together, and all the variables
-m.3+15=0
We move all terms containing m to the left, all other terms to the right
-m.3=-15
m=-15/1
m=-15
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