-20=7-d-8d

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



-20=7-d-8d

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-9d+7)-20=0

We get rid of parentheses

9d-7-20=0

We add all the numbers together, and all the variables

9d-27=0

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

9d=27

d=27/9

d=3

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