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k in (-oo:+oo)
(2/3)*k+2 = 38/27 // - 38/27
(2/3)*k-(38/27)+2 = 0
(2/3)*k-38/27+2 = 0
2/3*k+16/27 = 0 // - 16/27
2/3*k = -16/27 // : 2/3
k = -16/27/2/3
k = -8/9
k = -8/9
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