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x in (-oo:+oo)
X = (1/2)*(16-(8*Y)) // - (1/2)*(16-(8*Y))
X-((1/2)*(16-(8*Y))) = 0
(-1/2)*(16-8*Y)+X = 0
X-1/2*(16-8*Y) = 0
X-1/2*(16-8*Y) = 0
X+4*Y-8 = 0
X+4*Y-8 = 0
x belongs to the empty set
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