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k in (-oo:+oo)
4*(-5*k-8) = 188 // - 188
4*(-5*k-8)-188 = 0
4*(-5*k-8)-188 = 0
-20*k-220 = 0
-20*k-220 = 0
-20*k-220 = 0 // + 220
-20*k = 220 // : -20
k = 220/(-20)
k = -11
k = -11
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