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d in (-oo:+oo)
2*d+8 = 29-5*d // - 29-5*d
2*d-(-5*d)-29+8 = 0
2*d+5*d-29+8 = 0
7*d-21 = 0 // + 21
7*d = 21 // : 7
d = 21/7
d = 3
d = 3
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