420=10d+20

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Solution for 420=10d+20 equation: 



420=10d+20

We move all terms to the left:

420-(10d+20)=0

We get rid of parentheses

-10d-20+420=0

We add all the numbers together, and all the variables

-10d+400=0

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

-10d=-400

d=-400/-10

d=+40

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