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x in (-oo:+oo)
8/20 = x/80 // - x/80
8/20-(x/80) = 0
2/5-1/80*x = 0 // - 2/5
-1/80*x = -2/5 // : -1/80
x = -2/5/(-1/80)
x = 32
x = 32
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