9-d-4d=9

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Solution for 9-d-4d=9 equation: 


d in (-oo:+oo)

9-d-(4*d) = 9 // - 9

9-d-(4*d)-9 = 0

9-d-4*d-9 = 0

-5*d = 0 // : -5

d = 0

d = 0

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