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k in (-oo:+oo)
2/3-((3/5)*k) = -89/15 // + -89/15
2/3-((3/5)*k)-(-89/15) = 0
(-3/5)*k+2/3+89/15 = 0
33/5-3/5*k = 0 // - 33/5
-3/5*k = -33/5 // : -3/5
k = -33/5/(-3/5)
k = 11
k = 11
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