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k in (-oo:+oo)
4*k-(4/9) = 14/9 // - 14/9
4*k-(4/9)-(14/9) = 0
4*k-4/9-14/9 = 0
4*k-2 = 0 // + 2
4*k = 2 // : 4
k = 2/4
k = 1/2
k = 1/2
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