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d in (-oo:+oo)
d/5 = 2/4 // - 2/4
d/5-(2/4) = 0
d/5-1/2 = 0
1/5*d-1/2 = 0 // + 1/2
1/5*d = 1/2 // : 1/5
d = 1/2/1/5
d = 5/2
d = 5/2
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