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x in (-oo:+oo)
8/10 = x/100 // - x/100
8/10-(x/100) = 0
4/5-1/100*x = 0 // - 4/5
-1/100*x = -4/5 // : -1/100
x = -4/5/(-1/100)
x = 80
x = 80
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