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x in (-oo:+oo)
X = (156-(9*y))/5 // - (156-(9*y))/5
X-((156-(9*y))/5) = 0
X-((156-9*y)/5) = 0
(-1*(156-9*y))/5+X = 0
(-1*(156-9*y))/5+(5*X)/5 = 0
5*X-1*(156-9*y) = 0
5*X+9*y-156 = 0
(5*X+9*y-156)/5 = 0
(5*X+9*y-156)/5 = 0 // * 5
5*X+9*y-156 = 0
x belongs to the empty set
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