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25+42.50d=40+37.50d
We move all terms to the left:
25+42.50d-(40+37.50d)=0
We add all the numbers together, and all the variables
42.50d-(37.50d+40)+25=0
We get rid of parentheses
42.50d-37.50d-40+25=0
We add all the numbers together, and all the variables
5d-15=0
We move all terms containing d to the left, all other terms to the right
5d=15
d=15/5
d=3
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