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x in (-oo:+oo)
4/5 = x/250000 // - x/250000
4/5-(x/250000) = 0
4/5-1/250000*x = 0 // - 4/5
-1/250000*x = -4/5 // : -1/250000
x = -4/5/(-1/250000)
x = 200000
x = 200000
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