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k in (-oo:+oo)
6*k-(2*k)+6 = -26 // + 26
6*k-(2*k)+6+26 = 0
6*k-2*k+6+26 = 0
4*k+32 = 0 // - 32
4*k = -32 // : 4
k = -32/4
k = -8
k = -8
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