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27=m/5+21
We move all terms to the left:
27-(m/5+21)=0
We get rid of parentheses
-m/5-21+27=0
We multiply all the terms by the denominator
-m-21*5+27*5=0
We add all the numbers together, and all the variables
-1m+30=0
We move all terms containing m to the left, all other terms to the right
-m=-30
m=-30/-1
m=+30
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