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k in (-oo:+oo)
5*(8-3*k) = 220 // - 220
5*(8-3*k)-220 = 0
5*(8-3*k)-220 = 0
-15*k-180 = 0
-15*k-180 = 0
-15*k-180 = 0 // + 180
-15*k = 180 // : -15
k = 180/(-15)
k = -12
k = -12
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