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k in (-oo:+oo)
4*k+4/9 = 53/18-6*k // - 53/18-6*k
4*k-(-6*k)+4/9-(53/18) = 0
4*k+6*k+4/9-53/18 = 0
10*k-5/2 = 0 // + 5/2
10*k = 5/2 // : 10
k = 5/2/10
k = 1/4
k = 1/4
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