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y in (-oo:+oo)
y = (5/4)*1.5^2 // - (5/4)*1.5^2
y-((5/4)*1.5^2) = 0
y+(-5/4)*1.5^2 = 0
y-5/4*1.5^2 = 0 // + -5/4*1.5^2
y = -(-5/4*1.5^2)
y = 5/4*1.5^2
y = 5/4*1.5^2
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