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x in (-oo:+oo)
8/25 = x/1000 // - x/1000
8/25-(x/1000) = 0
8/25-1/1000*x = 0 // - 8/25
-1/1000*x = -8/25 // : -1/1000
x = -8/25/(-1/1000)
x = 320
x = 320
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