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d in (-oo:+oo)
d/5 = 12/80 // - 12/80
d/5-(12/80) = 0
d/5-3/20 = 0
1/5*d-3/20 = 0 // + 3/20
1/5*d = 3/20 // : 1/5
d = 3/20/1/5
d = 3/4
d = 3/4
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