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k in (-oo:+oo)
1/3-(6/5) = k/15 // - k/15
1/3-(k/15)-(6/5) = 0
1/3-(k/15)-6/5 = 0
-1/15*k-13/15 = 0 // + 13/15
-1/15*k = 13/15 // : -1/15
k = 13/15/(-1/15)
k = -13
k = -13
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