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420+60d=420+60d-80d
We move all terms to the left:
420+60d-(420+60d-80d)=0
We add all the numbers together, and all the variables
60d-(-20d+420)+420=0
We get rid of parentheses
60d+20d-420+420=0
We add all the numbers together, and all the variables
80d=0
d=0/80
d=0
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