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t in (-oo:+oo)
3*t-(2*t^2)-(5*t)+1/(3^3) = 3 // - 3
3*t-(2*t^2)-(5*t)+1/(3^3)-3 = 0
3*t-2*t^2-5*t+1/(3^3)-3 = 0
-2*t^2-2*t-80/27 = 0
DELTA = (-2)^2-(-80/27*(-2)*4)
DELTA = -532/27
DELTA < 0
t belongs to the empty set
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