9=-2d+6d+9

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Solution for 9=-2d+6d+9 equation: 


d in (-oo:+oo)

9 = 6*d-2*d+9 // - 6*d-2*d+9

9-(-2*d)-(6*d)-9 = 0

2*d-6*d-9+9 = 0

-4*d = 0 // : -4

d = 0

d = 0

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