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y in (-oo:+oo)
y = (1/2)*(1-8) // - (1/2)*(1-8)
y-((1/2)*(1-8)) = 0
y+(-1/2)*(1-8) = 0
y+7/2 = 0 // - 7/2
y = -7/2
y = -7/2
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