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x in (-oo:+oo)
x = 100-(100*(1/y)) // - 100-(100*(1/y))
x+100*(1/y)-100 = 0
x+100*y^-1-100 = 0 // - 100*y^-1-100
x = -(100*y^-1-100)
x = 100-(100*y^-1)
x = 100-(100*y^-1)
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