-2d-1=-9

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Solution for -2d-1=-9 equation: 


d in (-oo:+oo)

-2*d-1 = -9 // + 9

9-2*d-1 = 0

8-2*d = 0 // - 8

-2*d = -8 // : -2

d = -8/(-2)

d = 4

d = 4

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