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x in (-oo:+oo)
X = (2.25*y)/z // - (2.25*y)/z
X-((2.25*y)/z) = 0
X-2.25*y*z^-1 = 0
X-2.25*y*z^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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