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k in (-oo:+oo)
(1/3)*(39-6*k) = 14*k+2 // - 14*k+2
(1/3)*(39-6*k)-(14*k)-2 = 0
(1/3)*(39-6*k)-14*k-2 = 0
1/3*(39-6*k)-14*k-2 = 0
1/3*(39-6*k)-14*k-2 = 0
13-16*k-2 = 0
11-16*k = 0
11-16*k = 0
11-16*k = 0 // - 11
-16*k = -11 // : -16
k = -11/(-16)
k = 11/16
k = 11/16
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