420=15(20+d)

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



420=15(20+d)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(15(d+20)), so:

15(d+20)

We multiply parentheses

15d+300

Back to the equation:

-(15d+300)



We get rid of 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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