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k in (-oo:+oo)
1/3-(2/5) = k/15 // - k/15
1/3-(k/15)-(2/5) = 0
1/3-(k/15)-2/5 = 0
-1/15*k-1/15 = 0 // + 1/15
-1/15*k = 1/15 // : -1/15
k = 1/15/(-1/15)
k = -1
k = -1
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