15(20+2d)=420

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Solution for 15(20+2d)=420 equation: 



15(20+2d)=420

We move all terms to the left:

15(20+2d)-(420)=0

We add all the numbers together, and all the variables

15(2d+20)-420=0

We multiply parentheses

30d+300-420=0

We add all the numbers together, and all the variables

30d-120=0

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

30d=120

d=120/30

d=4

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