-20=7d-2d

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Solution for -20=7d-2d equation: 



-20=7d-2d

We move all terms to the left:

-20-(7d-2d)=0

We add all the numbers together, and all the variables

-(+5d)-20=0

We get rid of parentheses

-5d-20=0

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

-5d=20

d=20/-5

d=-4

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