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x in (-oo:+oo)
7280/560000 = x/790000 // - x/790000
7280/560000-(x/790000) = 0
13/1000-1/790000*x = 0 // - 13/1000
-1/790000*x = -13/1000 // : -1/790000
x = -13/1000/(-1/790000)
x = 10270
x = 10270
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