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k in (-oo:+oo)
2-((2/3)*k) = 5 // - 5
2-((2/3)*k)-5 = 0
(-2/3)*k-5+2 = 0
-2/3*k-3 = 0 // + 3
-2/3*k = 3 // : -2/3
k = 3/(-2/3)
k = -9/2
k = -9/2
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