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k in (-oo:+oo)
k/3 = 4/8 // - 4/8
k/3-(4/8) = 0
k/3-1/2 = 0
1/3*k-1/2 = 0 // + 1/2
1/3*k = 1/2 // : 1/3
k = 1/2/1/3
k = 3/2
k = 3/2
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