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x in (-oo:+oo)
0.25/500 = x/1000 // - x/1000
0.25/500-(x/1000) = 0
0.0005-1/1000*x = 0 // - 0.0005
-1/1000*x = -0.0005 // : -1/1000
x = -0.0005/(-1/1000)
x = 0.5
x = 0.5
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