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k in (-oo:+oo)
k-(7*k)+9 = -33 // + 33
k-(7*k)+9+33 = 0
k-7*k+9+33 = 0
42-6*k = 0 // - 42
-6*k = -42 // : -6
k = -42/(-6)
k = 7
k = 7
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