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