420+60d=420-20d

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Solution for 420+60d=420-20d equation: 



420+60d=420-20d

We move all terms to the left:

420+60d-(420-20d)=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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