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d in (-oo:+oo)
(1/2)*d-(3*d) = 2 // - 2
(1/2)*d-(3*d)-2 = 0
(1/2)*d-3*d-2 = 0
-5/2*d-2 = 0 // + 2
-5/2*d = 2 // : -5/2
d = 2/(-5/2)
d = -4/5
d = -4/5
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