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d in (-oo:+oo)
(5/2)*d+1 = 3*d-4 // - 3*d-4
(5/2)*d-(3*d)+1+4 = 0
(5/2)*d-3*d+1+4 = 0
5-1/2*d = 0 // - 5
-1/2*d = -5 // : -1/2
d = -5/(-1/2)
d = 10
d = 10
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