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x in (-oo:+oo)
2/3 = x/40000 // - x/40000
2/3-(x/40000) = 0
2/3-1/40000*x = 0 // - 2/3
-1/40000*x = -2/3 // : -1/40000
x = -2/3/(-1/40000)
x = 80000/3
x = 80000/3
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