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x in (-oo:+oo)
12/10000 = x/500 // - x/500
12/10000-(x/500) = 0
3/2500-1/500*x = 0 // - 3/2500
-1/500*x = -3/2500 // : -1/500
x = -3/2500/(-1/500)
x = 3/5
x = 3/5
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