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k in (-oo:+oo)
(1/4)*(48-12*k) = 10*k+2 // - 10*k+2
(1/4)*(48-12*k)-(10*k)-2 = 0
(1/4)*(48-12*k)-10*k-2 = 0
1/4*(48-12*k)-10*k-2 = 0
1/4*(48-12*k)-10*k-2 = 0
12-13*k-2 = 0
10-13*k = 0
10-13*k = 0
10-13*k = 0 // - 10
-13*k = -10 // : -13
k = -10/(-13)
k = 10/13
k = 10/13
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