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x in (-oo:+oo)
8/1250 = x/4000 // - x/4000
8/1250-(x/4000) = 0
4/625-1/4000*x = 0 // - 4/625
-1/4000*x = -4/625 // : -1/4000
x = -4/625/(-1/4000)
x = 128/5
x = 128/5
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