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k in (-oo:+oo)
4-2*k = 50/9 // - 50/9
4-2*k-(50/9) = 0
4-2*k-50/9 = 0
-2*k-14/9 = 0 // + 14/9
-2*k = 14/9 // : -2
k = 14/9/(-2)
k = -7/9
k = -7/9
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