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x in (-oo:+oo)
130/250 = x/100 // - x/100
130/250-(x/100) = 0
13/25-1/100*x = 0 // - 13/25
-1/100*x = -13/25 // : -1/100
x = -13/25/(-1/100)
x = 52
x = 52
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