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x in (-oo:+oo)
x/y = 1.64 // - 1.64
x/y-1.64 = 0
x*y^-1-1.64 = 0 // + 1.64
x*y^-1 = 1.64 // : y^-1
x = 1.64/(y^-1)
x = 1.64/(y^-1)
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