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