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d in (-oo:+oo)
(5/2)*d-(2/3) = -1/2 // + -1/2
(5/2)*d-(2/3)-(-1/2) = 0
(5/2)*d-2/3+1/2 = 0
5/2*d-1/6 = 0 // + 1/6
5/2*d = 1/6 // : 5/2
d = 1/6/5/2
d = 1/15
d = 1/15
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