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x in (-oo:+oo)
10/20 = x/100 // - x/100
10/20-(x/100) = 0
1/2-1/100*x = 0 // - 1/2
-1/100*x = -1/2 // : -1/100
x = -1/2/(-1/100)
x = 50
x = 50
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