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k in (-oo:+oo)
-20/3 = 4*k+4*k-8 // - 4*k+4*k-8
8-(4*k)-(4*k)-20/3 = 0
8-4*k-4*k-20/3 = 0
4/3-8*k = 0 // - 4/3
-8*k = -4/3 // : -8
k = -4/3/(-8)
k = 1/6
k = 1/6
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