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x in (-oo:+oo)
400 = (8/100)*x // - (8/100)*x
400-((8/100)*x) = 0
(-2/25)*x+400 = 0
400-2/25*x = 0 // - 400
-2/25*x = -400 // : -2/25
x = -400/(-2/25)
x = 5000
x = 5000
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