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k in (-oo:+oo)
k/15 = 4/5 // - 4/5
k/15-(4/5) = 0
k/15-4/5 = 0
1/15*k-4/5 = 0 // + 4/5
1/15*k = 4/5 // : 1/15
k = 4/5/1/15
k = 12
k = 12
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