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