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d in (-oo:+oo)
-18 = 4*d+4*d-10 // - 4*d+4*d-10
10-(4*d)-(4*d)-18 = 0
10-4*d-4*d-18 = 0
-8*d-8 = 0 // + 8
-8*d = 8 // : -8
d = 8/(-8)
d = -1
d = -1
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