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12=3.m
We move all terms to the left:
12-(3.m)=0
We add all the numbers together, and all the variables
-(+3.m)+12=0
We get rid of parentheses
-3.m+12=0
We add all the numbers together, and all the variables
-3m+12=0
We move all terms containing m to the left, all other terms to the right
-3m=-12
m=-12/-3
m=+4
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