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m/3-12=-5
We move all terms to the left:
m/3-12-(-5)=0
We add all the numbers together, and all the variables
m/3-7=0
We multiply all the terms by the denominator
m-7*3=0
We add all the numbers together, and all the variables
m-21=0
We move all terms containing m to the left, all other terms to the right
m=21
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