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k in (-oo:+oo)
240 = (9/5)*k-460 // - (9/5)*k-460
240-((9/5)*k)+460 = 0
(-9/5)*k+240+460 = 0
700-9/5*k = 0 // - 700
-9/5*k = -700 // : -9/5
k = -700/(-9/5)
k = 3500/9
k = 3500/9
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