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