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