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k in (-oo:+oo)
5*k = 14/15 // - 14/15
5*k-(14/15) = 0
5*k-14/15 = 0
5*k-14/15 = 0 // + 14/15
5*k = 14/15 // : 5
k = 14/15/5
k = 14/75
k = 14/75
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