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x in (-oo:+oo)
-(3*y)-3*2 = (1/4)*(X-13) // - (1/4)*(X-13)
-((1/4)*(X-13))-(3*y)-3*2 = 0
(-1/4)*(X-13)-3*y-3*2 = 0
-1/4*(X-13)-3*y-6 = 0
-1/4*(X-13)-3*y-6 = 0
13/4-1/4*X-3*y-6 = 0
-1/4*X-3*y-11/4 = 0
-1/4*X-3*y-11/4 = 0
x belongs to the empty set
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