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k in (-oo:+oo)
397/9 = 2*k-6*k+1/9 // - 2*k-6*k+1/9
397/9-(-6*k)-(2*k)-(1/9) = 0
6*k-2*k+397/9-1/9 = 0
4*k+44 = 0 // - 44
4*k = -44 // : 4
k = -44/4
k = -11
k = -11
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