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x in (-oo:+oo)
20/50 = x/100 // - x/100
20/50-(x/100) = 0
2/5-1/100*x = 0 // - 2/5
-1/100*x = -2/5 // : -1/100
x = -2/5/(-1/100)
x = 40
x = 40
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