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x in (-oo:+oo)
X = (1/2)*(18-(8*y)) // - (1/2)*(18-(8*y))
X-((1/2)*(18-(8*y))) = 0
(-1/2)*(18-8*y)+X = 0
X-1/2*(18-8*y) = 0
X-1/2*(18-8*y) = 0
X+4*y-9 = 0
X+4*y-9 = 0
x belongs to the empty set
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