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x in (-oo:+oo)
X = (6*y-15)/(-2) // - (6*y-15)/(-2)
X-((6*y-15)/(-2)) = 0
(-1*(6*y-15))/(-2)+X = 0
(-1*(6*y-15))/(-2)+(-2*X)/(-2) = 0
-1*(6*y-15)-2*X = 0
15-2*X-6*y = 0
(15-2*X-6*y)/(-2) = 0
(15-2*X-6*y)/(-2) = 0 // * -2
15-2*X-6*y = 0
x belongs to the empty set
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