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k in (-oo:+oo)
17 = 3*k+k+9 // - 3*k+k+9
17-(3*k)-k-9 = 0
17-3*k-k-9 = 0
8-4*k = 0 // - 8
-4*k = -8 // : -4
k = -8/(-4)
k = 2
k = 2
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