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d in (-oo:+oo)
-(2*d)-10 = -18 // + 18
18-(2*d)-10 = 0
18-2*d-10 = 0
8-2*d = 0 // - 8
-2*d = -8 // : -2
d = -8/(-2)
d = 4
d = 4
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