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d in (-oo:+oo)
15 = 5*d+4*d+6 // - 5*d+4*d+6
15-(5*d)-(4*d)-6 = 0
15-5*d-4*d-6 = 0
9-9*d = 0 // - 9
-9*d = -9 // : -9
d = -9/(-9)
d = 1
d = 1
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