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k in (-oo:+oo)
k/12 = -(k/12)-1/3 // + -(k/12)-1/3
k/12+k/12-(-1/3) = 0
k/12+k/12+1/3 = 0
1/6*k+1/3 = 0 // - 1/3
1/6*k = -1/3 // : 1/6
k = -1/3/1/6
k = -2
k = -2
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