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x in (-oo:+oo)
X = (3/5)*(y+z) // - (3/5)*(y+z)
X-((3/5)*(y+z)) = 0
(-3/5)*(y+z)+X = 0
X-3/5*(y+z) = 0
X-3/5*(y+z) = 0
X-3/5*y-3/5*z = 0
X-3/5*y-3/5*z = 0
x belongs to the empty set
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