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k in (-oo:+oo)
5*(2-(5*k)) = -240 // + 240
5*(2-(5*k))+240 = 0
5*(2-5*k)+240 = 0
5*(2-5*k)+240 = 0
250-25*k = 0
250-25*k = 0
250-25*k = 0 // - 250
-25*k = -250 // : -25
k = -250/(-25)
k = 10
k = 10
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