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y in (-oo:+oo)
(1/4)*(20-(4*y)) = 6-y // - 6-y
(1/4)*(20-(4*y))+y-6 = 0
(1/4)*(20-4*y)+y-6 = 0
1/4*(20-4*y)+y-6 = 0
1/4*(20-4*y)+y-6 = 0
5-6 = 0
-1 = 0
-1 = 0
y belongs to the empty set
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