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k in (-oo:+oo)
4*k-1 = 5*k-10 // - 5*k-10
4*k-(5*k)-1+10 = 0
4*k-5*k-1+10 = 0
9-k = 0 // - 9
-k = -9 // * -1
k = 9
k = 9
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