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y in (-oo:+oo)
(1/2)*((1/2)*y-(1/2)) = 0
(1/2)*((1/2)*y-1/2) = 0
1/2*(1/2*y-1/2) = 0
1/2*y-1/2 = 0 // + 1/2
1/2*y = 1/2 // : 1/2
y = 1/2/1/2
y = 1
y = 1
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