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x in (-oo:+oo)
3/40 = x/1000 // - x/1000
3/40-(x/1000) = 0
3/40-1/1000*x = 0 // - 3/40
-1/1000*x = -3/40 // : -1/1000
x = -3/40/(-1/1000)
x = 75
x = 75
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