-31=7d+4d+2

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Solution for -31=7d+4d+2 equation: 


d in (-oo:+oo)

-31 = 7*d+4*d+2 // - 7*d+4*d+2

-(7*d)-(4*d)-31-2 = 0

-7*d-4*d-31-2 = 0

-11*d-33 = 0 // + 33

-11*d = 33 // : -11

d = 33/(-11)

d = -3

d = -3

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