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k in (-oo:+oo)
5*(-(5*k)-8) = 110 // - 110
5*(-(5*k)-8)-110 = 0
5*(-5*k-8)-110 = 0
5*(-5*k-8)-110 = 0
-25*k-150 = 0
-25*k-150 = 0
-25*k-150 = 0 // + 150
-25*k = 150 // : -25
k = 150/(-25)
k = -6
k = -6
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