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x in (-oo:+oo)
50 = (x/80)/60 // - (x/80)/60
50-((x/80)/60) = 0
(-1/4800)*x+50 = 0
50-1/4800*x = 0 // - 50
-1/4800*x = -50 // : -1/4800
x = -50/(-1/4800)
x = 240000
x = 240000
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