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x in (-oo:+oo)
X = 2*y-(z/4) // - 2*y-(z/4)
X-(2*y)+z/4 = 0
X-2*y+z/4 = 0
X-2*y+1/4*z = 0
x naleu017Cy do R
x in (-oo:+oo)
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