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k in (-oo:+oo)
2-2*k = 4*k-34 // - 4*k-34
2-2*k-(4*k)+34 = 0
2-2*k-4*k+34 = 0
36-6*k = 0 // - 36
-6*k = -36 // : -6
k = -36/(-6)
k = 6
k = 6
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