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d in (-oo:+oo)
d/5-(1/5) = 14/5 // - 14/5
d/5-(1/5)-(14/5) = 0
d/5-1/5-14/5 = 0
1/5*d-3 = 0 // + 3
1/5*d = 3 // : 1/5
d = 3/1/5
d = 15
d = 15
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