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9m-4=-3m-4+12m
We move all terms to the left:
9m-4-(-3m-4+12m)=0
We add all the numbers together, and all the variables
9m-(9m-4)-4=0
We get rid of parentheses
9m-9m+4-4=0
We add all the numbers together, and all the variables
=0
m=0/1
m=0
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