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k in (-oo:+oo)
5*(3-1*k) = 5 // - 5
5*(3-1*k)-5 = 0
5*(3-k)-5 = 0
5*(3-k)-5 = 0
10-5*k = 0
10-5*k = 0
10-5*k = 0 // - 10
-5*k = -10 // : -5
k = -10/(-5)
k = 2
k = 2
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