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k in (-oo:+oo)
(2/7)*k+3/7 = 4*k-33 // - 4*k-33
(2/7)*k-(4*k)+3/7+33 = 0
(2/7)*k-4*k+3/7+33 = 0
234/7-26/7*k = 0 // - 234/7
-26/7*k = -234/7 // : -26/7
k = -234/7/(-26/7)
k = 9
k = 9
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