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y in (-oo:+oo)
y = 2/3-(7/3)^2 // - 2/3-(7/3)^2
y-(2/3)+(7/3)^2 = 0
y-2/3+(7/3)^2 = 0
y+43/9 = 0 // - 43/9
y = -43/9
y = -43/9
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