-d-20=-4d+d+20

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Solution for -d-20=-4d+d+20 equation: 



-d-20=-4d+d+20

We move all terms to the left:

-d-20-(-4d+d+20)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1d-(-3d+20)-20=0

We get rid of parentheses

-1d+3d-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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