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d in (-oo:+oo)
5*d = 3/10 // - 3/10
5*d-(3/10) = 0
5*d-3/10 = 0
5*d-3/10 = 0 // + 3/10
5*d = 3/10 // : 5
d = 3/10/5
d = 3/50
d = 3/50
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