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d in (-oo:+oo)
-d-2 = 3*d-18 // - 3*d-18
18-d-(3*d)-2 = 0
18-d-3*d-2 = 0
16-4*d = 0 // - 16
-4*d = -16 // : -4
d = -16/(-4)
d = 4
d = 4
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