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k in (-oo:+oo)
5*(-(6*k)-2) = 320 // - 320
5*(-(6*k)-2)-320 = 0
5*(-6*k-2)-320 = 0
5*(-6*k-2)-320 = 0
-30*k-330 = 0
-30*k-330 = 0
-30*k-330 = 0 // + 330
-30*k = 330 // : -30
k = 330/(-30)
k = -11
k = -11
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