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k in (-oo:+oo)
4.2 = k/6 // - k/6
4.2-(k/6) = 0
4.2-1/6*k = 0 // - 4.2
-1/6*k = -4.2 // : -1/6
k = -4.2/(-1/6)
k = 25.1999995
k = 25.1999995
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