420=d-20

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Solution for 420=d-20 equation: 



420=d-20

We move all terms to the left:

420-(d-20)=0

We get rid of parentheses

-d+20+420=0

We add all the numbers together, and all the variables

-1d+440=0

We move all terms containing d to the left, all other terms to the right

-d=-440

d=-440/-1

d=+440

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