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k in (-oo:+oo)
2*(8-1*k) = 28 // - 28
2*(8-1*k)-28 = 0
2*(8-k)-28 = 0
2*(8-k)-28 = 0
-2*k-12 = 0
-2*k-12 = 0
-2*k-12 = 0 // + 12
-2*k = 12 // : -2
k = 12/(-2)
k = -6
k = -6
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