-20-d=7+6d-6

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Solution for -20-d=7+6d-6 equation: 



-20-d=7+6d-6

We move all terms to the left:

-20-d-(7+6d-6)=0

We add all the numbers together, and all the variables

-d-(6d+1)-20=0

We add all the numbers together, and all the variables

-1d-(6d+1)-20=0

We get rid of parentheses

-1d-6d-1-20=0

We add all the numbers together, and all the variables

-7d-21=0

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

-7d=21

d=21/-7

d=-3

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