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k in (-oo:+oo)
(-2/3)*k = -1/9 // + -1/9
(-2/3)*k-(-1/9) = 0
(-2/3)*k+1/9 = 0
1/9-2/3*k = 0 // - 1/9
-2/3*k = -1/9 // : -2/3
k = -1/9/(-2/3)
k = 1/6
k = 1/6
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