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k in (-oo:+oo)
5*(4-(6*k)) = -340 // + 340
5*(4-(6*k))+340 = 0
5*(4-6*k)+340 = 0
5*(4-6*k)+340 = 0
360-30*k = 0
360-30*k = 0
360-30*k = 0 // - 360
-30*k = -360 // : -30
k = -360/(-30)
k = 12
k = 12
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