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k in (-oo:+oo)
(1/2)*(28-4*k) = 14*k+6 // - 14*k+6
(1/2)*(28-4*k)-(14*k)-6 = 0
(1/2)*(28-4*k)-14*k-6 = 0
1/2*(28-4*k)-14*k-6 = 0
1/2*(28-4*k)-14*k-6 = 0
14-16*k-6 = 0
8-16*k = 0
8-16*k = 0
8-16*k = 0 // - 8
-16*k = -8 // : -16
k = -8/(-16)
k = 1/2
k = 1/2
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