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x in (-oo:+oo)
x^2+11*x+121/4 = 0
x^2+11*x+121/4 = 0
DELTA = 11^2-(1*4*121/4)
DELTA = 0
x = -11/(1*2)
x = -11/2 or x = -11/2
x in { -11/2, -11/2 }
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