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d in (-oo:+oo)
-46/55 = 2*d-((2/5)*d)-2 // - 2*d-((2/5)*d)-2
(2/5)*d-(2*d)-46/55+2 = 0
(2/5)*d-2*d-46/55+2 = 0
64/55-8/5*d = 0 // - 64/55
-8/5*d = -64/55 // : -8/5
d = -64/55/(-8/5)
d = 8/11
d = 8/11
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