-20=-2d-d+1

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Solution for -20=-2d-d+1 equation: 


d in (-oo:+oo)

-20 = 1-2*d-d // - 1-2*d-d

d-(-2*d)-20-1 = 0

2*d+d-20-1 = 0

3*d-21 = 0 // + 21

3*d = 21 // : 3

d = 21/3

d = 7

d = 7

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