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k in (-oo:+oo)
-((2/3)*k)-1/4 = -43/12 // + -43/12
-((2/3)*k)-1/4-(-43/12) = 0
(-2/3)*k-1/4+43/12 = 0
10/3-2/3*k = 0 // - 10/3
-2/3*k = -10/3 // : -2/3
k = -10/3/(-2/3)
k = 5
k = 5
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