31=7d+d-1

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Solution for 31=7d+d-1 equation: 


d in (-oo:+oo)

31 = 7*d+d-1 // - 7*d+d-1

1-(7*d)-d+31 = 0

1-7*d-d+31 = 0

32-8*d = 0 // - 32

-8*d = -32 // : -8

d = -32/(-8)

d = 4

d = 4

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