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x in (-oo:+oo)
x^2+3*x+9/4 = 0
x^2+3*x+9/4 = 0
DELTA = 3^2-(1*9/4*4)
DELTA = 0
x = -3/(1*2)
x = -3/2 or x = -3/2
x in { -3/2, -3/2 }
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