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x in (-oo:+oo)
3/5 = x/2000 // - x/2000
3/5-(x/2000) = 0
3/5-1/2000*x = 0 // - 3/5
-1/2000*x = -3/5 // : -1/2000
x = -3/5/(-1/2000)
x = 1200
x = 1200
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