-d+20=-20+d

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



-d+20=-20+d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-1d-d+20+20=0

We add all the numbers together, and all the variables

-2d+40=0

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

-2d=-40

d=-40/-2

d=+20

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