-20-d=20+7d

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



-20-d=20+7d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1d-(7d+20)-20=0

We get rid of parentheses

-1d-7d-20-20=0

We add all the numbers together, and all the variables

-8d-40=0

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

-8d=40

d=40/-8

d=-5

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