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y in (-oo:+oo)
(1/2)*y = 2*((1/4)*y-9) // - 2*((1/4)*y-9)
(1/2)*y-(2*((1/4)*y-9)) = 0
(1/2)*y-2*((1/4)*y-9) = 0
y/2-2*(1/4*y-9) = 0
(-2*2*(1/4*y-9))/2+y/2 = 0
y-2*2*(1/4*y-9) = 0
36 = 0
36/2 = 0
36/2 = 0 // * 2
36 = 0
36 = 0
y belongs to the empty set
y belongs to the empty set
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