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k in (-oo:+oo)
19/15 = k+2/3 // - k+2/3
19/15-k-(2/3) = 0
19/15-k-2/3 = 0
3/5-k = 0 // - 3/5
-k = -3/5 // * -1
k = 3/5
k = 3/5
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