15(20=d)=420

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



15(20=d)=420

We move all terms to the left:

15(20-(d))=0

We add all the numbers together, and all the variables

15(-1d+20)=0

We multiply parentheses

-15d+300=0

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

-15d=-300

d=-300/-15

d=+20

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