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k in (-oo:+oo)
2*k-4 = -10/3 // + -10/3
2*k-(-10/3)-4 = 0
2*k+10/3-4 = 0
2*k-2/3 = 0 // + 2/3
2*k = 2/3 // : 2
k = 2/3/2
k = 1/3
k = 1/3
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