-1-8d=-7d-20

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Solution for -1-8d=-7d-20 equation: 



-1-8d=-7d-20

We move all terms to the left:

-1-8d-(-7d-20)=0

We get rid of parentheses

-8d+7d+20-1=0

We add all the numbers together, and all the variables

-1d+19=0

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

-d=-19

d=-19/-1

d=+19

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