9+2d=1

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Solution for 9+2d=1 equation: 


d in (-oo:+oo)

2*d+9 = 1 // - 1

2*d-1+9 = 0

2*d+8 = 0 // - 8

2*d = -8 // : 2

d = -8/2

d = -4

d = -4

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