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x in (-oo:+oo)
100/425 = x/1000 // - x/1000
100/425-(x/1000) = 0
4/17-1/1000*x = 0 // - 4/17
-1/1000*x = -4/17 // : -1/1000
x = -4/17/(-1/1000)
x = 4000/17
x = 4000/17
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