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k in (-oo:+oo)
9*(k-(2/3))+33 = 0
9*(k-2/3)+33 = 0
9*(k-2/3)+33 = 0
9*k+27 = 0
9*k+27 = 0
9*k+27 = 0 // - 27
9*k = -27 // : 9
k = -27/9
k = -3
k = -3
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