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15/1=d/7
We move all terms to the left:
15/1-(d/7)=0
We add all the numbers together, and all the variables
-(+d/7)+15/1=0
We add all the numbers together, and all the variables
-(+d/7)=0
We get rid of parentheses
-d/7=0
We multiply all the terms by the denominator
-d=0
d=0/-1
d=0
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