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k in (-oo:+oo)
5*k+6 = 94/9 // - 94/9
5*k-(94/9)+6 = 0
5*k-94/9+6 = 0
5*k-40/9 = 0 // + 40/9
5*k = 40/9 // : 5
k = 40/9/5
k = 8/9
k = 8/9
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