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d in (-oo:+oo)
(2/5)*d+5 = 24/5 // - 24/5
(2/5)*d-(24/5)+5 = 0
(2/5)*d-24/5+5 = 0
2/5*d+1/5 = 0 // - 1/5
2/5*d = -1/5 // : 2/5
d = -1/5/2/5
d = -1/2
d = -1/2
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