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d in (-oo:+oo)
1/2-(5*d) = -29/2 // + -29/2
1/2-(5*d)-(-29/2) = 0
1/2-5*d+29/2 = 0
15-5*d = 0 // - 15
-5*d = -15 // : -5
d = -15/(-5)
d = 3
d = 3
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