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15=d/5-7
We move all terms to the left:
15-(d/5-7)=0
We get rid of parentheses
-d/5+7+15=0
We multiply all the terms by the denominator
-d+7*5+15*5=0
We add all the numbers together, and all the variables
-1d+110=0
We move all terms containing d to the left, all other terms to the right
-d=-110
d=-110/-1
d=+110
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