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k in (-oo:+oo)
-28 = k-4*k+2 // - k-4*k+2
-(-4*k)-k-28-2 = 0
4*k-k-28-2 = 0
3*k-30 = 0 // + 30
3*k = 30 // : 3
k = 30/3
k = 10
k = 10
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