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k in (-oo:+oo)
k-((6/5)*k)-30 = 0
k+(-6/5)*k-30 = 0
-1/5*k-30 = 0 // + 30
-1/5*k = 30 // : -1/5
k = 30/(-1/5)
k = -150
k = -150
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