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x in (-oo:+oo)
x^2+7*x+53 = 11/3 // - 11/3
x^2+7*x-(11/3)+53 = 0
x^2+7*x-11/3+53 = 0
x^2+7*x+148/3 = 0
DELTA = 7^2-(1*4*148/3)
DELTA = -445/3
DELTA < 0
x belongs to the empty set
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