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k in (-oo:+oo)
6 = (-2/5)*k-2 // - (-2/5)*k-2
2-((-2/5)*k)+6 = 0
(2/5)*k+2+6 = 0
2/5*k+8 = 0 // - 8
2/5*k = -8 // : 2/5
k = -8/2/5
k = -20
k = -20
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