-31=6d+4d+9

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Solution for -31=6d+4d+9 equation: 


d in (-oo:+oo)

-31 = 6*d+4*d+9 // - 6*d+4*d+9

-(6*d)-(4*d)-31-9 = 0

-6*d-4*d-31-9 = 0

-10*d-40 = 0 // + 40

-10*d = 40 // : -10

d = 40/(-10)

d = -4

d = -4

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