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x in (-oo:+oo)
X = (2*y-z)/4 // - (2*y-z)/4
X-((2*y-z)/4) = 0
(-1*(2*y-z))/4+X = 0
(-1*(2*y-z))/4+(4*X)/4 = 0
4*X-1*(2*y-z) = 0
4*X-2*y+z = 0
(4*X-2*y+z)/4 = 0
(4*X-2*y+z)/4 = 0 // * 4
4*X-2*y+z = 0
x belongs to the empty set
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