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k in (-oo:+oo)
k+3 = 3*k+23 // - 3*k+23
k-(3*k)-23+3 = 0
k-3*k-23+3 = 0
-2*k-20 = 0 // + 20
-2*k = 20 // : -2
k = 20/(-2)
k = -10
k = -10
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