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m/4+18=21
We move all terms to the left:
m/4+18-(21)=0
We add all the numbers together, and all the variables
m/4-3=0
We multiply all the terms by the denominator
m-3*4=0
We add all the numbers together, and all the variables
m-12=0
We move all terms containing m to the left, all other terms to the right
m=12
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