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k in (-oo:+oo)
5*(-5*k-9) = -295 // + 295
5*(-5*k-9)+295 = 0
5*(-5*k-9)+295 = 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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