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k in (-oo:+oo)
5*k+6 = 3*k-16 // - 3*k-16
5*k-(3*k)+6+16 = 0
5*k-3*k+6+16 = 0
2*k+22 = 0 // - 22
2*k = -22 // : 2
k = -22/2
k = -11
k = -11
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