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k in (-oo:+oo)
5*k+4 = 3*k+18 // - 3*k+18
5*k-(3*k)-18+4 = 0
5*k-3*k-18+4 = 0
2*k-14 = 0 // + 14
2*k = 14 // : 2
k = 14/2
k = 7
k = 7
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