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k in (-oo:+oo)
6*k+2/3 = 73/15 // - 73/15
6*k+2/3-(73/15) = 0
6*k+2/3-73/15 = 0
6*k-21/5 = 0 // + 21/5
6*k = 21/5 // : 6
k = 21/5/6
k = 7/10
k = 7/10
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