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x in (-oo:+oo)
4000 = x/(-40) // - x/(-40)
4000-(x/(-40)) = 0
1/40*x+4000 = 0 // - 4000
1/40*x = -4000 // : 1/40
x = -4000/1/40
x = -160000
x = -160000
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