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k in (-oo:+oo)
13 = 4*k-(3*k)+8 // - 4*k-(3*k)+8
3*k-(4*k)-8+13 = 0
3*k-4*k-8+13 = 0
5-k = 0 // - 5
-k = -5 // * -1
k = 5
k = 5
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