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k in (-oo:+oo)
5*k-(7*k)+9 = 33 // - 33
5*k-(7*k)-33+9 = 0
5*k-7*k-33+9 = 0
-2*k-24 = 0 // + 24
-2*k = 24 // : -2
k = 24/(-2)
k = -12
k = -12
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