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k in (-oo:+oo)
2/5-(2*k) = -1/3 // + -1/3
2/5-(2*k)-(-1/3) = 0
2/5-2*k+1/3 = 0
11/15-2*k = 0 // - 11/15
-2*k = -11/15 // : -2
k = -11/15/(-2)
k = 11/30
k = 11/30
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