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k in (-oo:+oo)
7*k-4 = 4*k+17 // - 4*k+17
7*k-(4*k)-17-4 = 0
7*k-4*k-17-4 = 0
3*k-21 = 0 // + 21
3*k = 21 // : 3
k = 21/3
k = 7
k = 7
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