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15=d/15
We move all terms to the left:
15-(d/15)=0
We add all the numbers together, and all the variables
-(+d/15)+15=0
We get rid of parentheses
-d/15+15=0
We multiply all the terms by the denominator
-d+15*15=0
We add all the numbers together, and all the variables
-1d+225=0
We move all terms containing d to the left, all other terms to the right
-d=-225
d=-225/-1
d=+225
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