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x in (-oo:+oo)
8 = (x/80)/1.5 // - (x/80)/1.5
8-((x/80)/1.5) = 0
(-1/120)*x+8 = 0
8-1/120*x = 0 // - 8
-1/120*x = -8 // : -1/120
x = -8/(-1/120)
x = 960
x = 960
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