20=-7d-3d-20

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Solution for 20=-7d-3d-20 equation: 



20=-7d-3d-20

We move all terms to the left:

20-(-7d-3d-20)=0

We add all the numbers together, and all the variables

-(-10d-20)+20=0

We get rid of parentheses

10d+20+20=0

We add all the numbers together, and all the variables

10d+40=0

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

10d=-40

d=-40/10

d=-4

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