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k in (-oo:+oo)
5*(10-(6*k)) = -190 // + 190
5*(10-(6*k))+190 = 0
5*(10-6*k)+190 = 0
5*(10-6*k)+190 = 0
240-30*k = 0
240-30*k = 0
240-30*k = 0 // - 240
-30*k = -240 // : -30
k = -240/(-30)
k = 8
k = 8
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