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x in (-oo:+oo)
X = (2/3)*(y-6) // - (2/3)*(y-6)
X-((2/3)*(y-6)) = 0
(-2/3)*(y-6)+X = 0
X-2/3*(y-6) = 0
X-2/3*(y-6) = 0
X-2/3*y+4 = 0
X-2/3*y+4 = 0
x belongs to the empty set
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