-1+3d=20

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Solution for -1+3d=20 equation: 


d in (-oo:+oo)

3*d-1 = 20 // - 20

3*d-20-1 = 0

3*d-21 = 0 // + 21

3*d = 21 // : 3

d = 21/3

d = 7

d = 7

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