(20+d)15=420

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Solution for (20+d)15=420 equation: 



(20+d)15=420

We move all terms to the left:

(20+d)15-(420)=0

We add all the numbers together, and all the variables

(d+20)15-420=0

We multiply parentheses

15d+300-420=0

We add all the numbers together, and all the variables

15d-120=0

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

15d=120

d=120/15

d=8

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