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x in (-oo:+oo)
X = (13-(4*y))/6 // - (13-(4*y))/6
X-((13-(4*y))/6) = 0
X-((13-4*y)/6) = 0
(-1*(13-4*y))/6+X = 0
(-1*(13-4*y))/6+(6*X)/6 = 0
6*X-1*(13-4*y) = 0
6*X+4*y-13 = 0
(6*X+4*y-13)/6 = 0
(6*X+4*y-13)/6 = 0 // * 6
6*X+4*y-13 = 0
x belongs to the empty set
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