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y in (-oo:+oo)
y = (1/3)*2^3-(5*2^2) // - (1/3)*2^3-(5*2^2)
y-((1/3)*2^3)+5*2^2 = 0
y+(-1/3)*2^3+5*2^2 = 0
y+52/3 = 0 // - 52/3
y = -52/3
y = -52/3
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