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k in (-oo:+oo)
-23 = 1-2*k-(6*k) // - 1-2*k-(6*k)
6*k-(-2*k)-23-1 = 0
2*k+6*k-23-1 = 0
8*k-24 = 0 // + 24
8*k = 24 // : 8
k = 24/8
k = 3
k = 3
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