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x in (-oo:+oo)
20/100 = x/800 // - x/800
20/100-(x/800) = 0
1/5-1/800*x = 0 // - 1/5
-1/800*x = -1/5 // : -1/800
x = -1/5/(-1/800)
x = 160
x = 160
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