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k in (-oo:+oo)
-6*k = -10/3 // + -10/3
-6*k-(-10/3) = 0
10/3-6*k = 0
10/3-6*k = 0 // - 10/3
-6*k = -10/3 // : -6
k = -10/3/(-6)
k = 5/9
k = 5/9
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