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15=d/4+15
We move all terms to the left:
15-(d/4+15)=0
We get rid of parentheses
-d/4-15+15=0
We multiply all the terms by the denominator
-d-15*4+15*4=0
We add all the numbers together, and all the variables
-d=0
d=0/-1
d=0
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