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25+42.50d=40=37.50d
We move all terms to the left:
25+42.50d-(40)=0
We add all the numbers together, and all the variables
42.50d-15=0
We move all terms containing d to the left, all other terms to the right
42.50d=15
d=15/42.50
d=5/14.166666666667
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