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x in (-oo:+oo)
x^2+5*x+25/4 = 0
x^2+5*x+25/4 = 0
DELTA = 5^2-(1*4*25/4)
DELTA = 0
x = -5/(1*2)
x = -5/2 or x = -5/2
x in { -5/2, -5/2 }
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