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x in (-oo:+oo)
X = (5/6)*(Y+Z) // - (5/6)*(Y+Z)
X-((5/6)*(Y+Z)) = 0
(-5/6)*(Y+Z)+X = 0
X-5/6*(Y+Z) = 0
X-5/6*(Y+Z) = 0
X-5/6*Y-5/6*Z = 0
X-5/6*Y-5/6*Z = 0
x belongs to the empty set
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