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x in (-oo:+oo)
100/220 = x/176 // - x/176
100/220-(x/176) = 0
5/11-1/176*x = 0 // - 5/11
-1/176*x = -5/11 // : -1/176
x = -5/11/(-1/176)
x = 80
x = 80
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