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.25+.10d=20
We move all terms to the left:
.25+.10d-(20)=0
We add all the numbers together, and all the variables
.10d-19.75=0
We move all terms containing d to the left, all other terms to the right
.10d=19.75
d=19.75/.10
d=197+0.049999999999997/.10
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