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y in (-oo:+oo)
y-(1/2) = 8*(2/5) // - 8*(2/5)
y-(1/2)-(8*(2/5)) = 0
y-1/2-16/5 = 0
y-37/10 = 0 // + 37/10
y = 37/10
y = 37/10
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