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k in (-oo:+oo)
k/2+2/3 = 5/6 // - 5/6
k/2+2/3-(5/6) = 0
k/2+2/3-5/6 = 0
1/2*k-1/6 = 0 // + 1/6
1/2*k = 1/6 // : 1/2
k = 1/6/1/2
k = 1/3
k = 1/3
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