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d in (-oo:+oo)
6-5*d = 18-2*d // - 18-2*d
6-5*d-(-2*d)-18 = 0
2*d-5*d-18+6 = 0
-3*d-12 = 0 // + 12
-3*d = 12 // : -3
d = 12/(-3)
d = -4
d = -4
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