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k in (-oo:+oo)
5*k+4 = 3*k-8 // - 3*k-8
5*k-(3*k)+4+8 = 0
5*k-3*k+4+8 = 0
2*k+12 = 0 // - 12
2*k = -12 // : 2
k = -12/2
k = -6
k = -6
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