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y in (-oo:+oo)
y = (1/2)*(2+3) // - (1/2)*(2+3)
y-((1/2)*(2+3)) = 0
y+(-1/2)*(2+3) = 0
y-5/2 = 0 // + 5/2
y = 5/2
y = 5/2
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