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k in (-oo:+oo)
(2/3)*k = -4/9 // + -4/9
(2/3)*k-(-4/9) = 0
(2/3)*k+4/9 = 0
2/3*k+4/9 = 0 // - 4/9
2/3*k = -4/9 // : 2/3
k = -4/9/2/3
k = -2/3
k = -2/3
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