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d in (-oo:+oo)
3-(5*d) = -3*d-17 // + -3*d-17
3-(5*d)-(-3*d)+17 = 0
3*d-5*d+3+17 = 0
20-2*d = 0 // - 20
-2*d = -20 // : -2
d = -20/(-2)
d = 10
d = 10
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