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15d=193.75
We move all terms to the left:
15d-(193.75)=0
We add all the numbers together, and all the variables
15d-193.75=0
We move all terms containing d to the left, all other terms to the right
15d=193.75
d=193.75/15
d=12+7.85714285714/8.57142857143
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