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k in (-oo:+oo)
6*k-(1/3) = -145/3 // + -145/3
6*k-(1/3)-(-145/3) = 0
6*k-1/3+145/3 = 0
6*k+48 = 0 // - 48
6*k = -48 // : 6
k = -48/6
k = -8
k = -8
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