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k in (-oo:+oo)
6*k+4 = 3*k-2 // - 3*k-2
6*k-(3*k)+2+4 = 0
6*k-3*k+2+4 = 0
3*k+6 = 0 // - 6
3*k = -6 // : 3
k = -6/3
k = -2
k = -2
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