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y in (-oo:+oo)
y = 250*(1/9)^2-3 // - 250*(1/9)^2-3
y-(250*(1/9)^2)+3 = 0
y-250*(1/9)^2+3 = 0
y-7/81 = 0 // + 7/81
y = 7/81
y = 7/81
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