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x in (-oo:+oo)
x = 200/y-400 // - 200/y-400
x-(200/y)+400 = 0
x-200*y^-1+400 = 0
x-200*y^-1+400 = 0 // - 400-200*y^-1
x = -(400-200*y^-1)
x = -(400-200*y^-1)
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