9-d=3d+1

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Solution for 9-d=3d+1 equation: 


d in (-oo:+oo)

9-d = 3*d+1 // - 3*d+1

9-d-(3*d)-1 = 0

9-d-3*d-1 = 0

8-4*d = 0 // - 8

-4*d = -8 // : -4

d = -8/(-4)

d = 2

d = 2

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