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k in (-oo:+oo)
4*k-(2*k)+5 = -9 // + 9
4*k-(2*k)+5+9 = 0
4*k-2*k+5+9 = 0
2*k+14 = 0 // - 14
2*k = -14 // : 2
k = -14/2
k = -7
k = -7
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