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