3+3d-7d=31

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Solution for 3+3d-7d=31 equation: 


d in (-oo:+oo)

3*d-(7*d)+3 = 31 // - 31

3*d-(7*d)-31+3 = 0

3*d-7*d-31+3 = 0

-4*d-28 = 0 // + 28

-4*d = 28 // : -4

d = 28/(-4)

d = -7

d = -7

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