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D( x )
3*x^2+x-4 = 0
3*x^2+x-4 = 0
3*x^2+x-4 = 0
3*x^2+x-4 = 0
DELTA = 1^2-(-4*3*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-1)/(2*3) or x = (-49^(1/2)-1)/(2*3)
x = 1 or x = -4/3
x in (-oo:-4/3) U (-4/3:1) U (1:+oo)
-7/(3*x^2+x-4) = 0
3*x^2+x-4 = 0
3*x^2+x-4 = 0
DELTA = 1^2-(-4*3*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-1)/(2*3) or x = (-49^(1/2)-1)/(2*3)
x = 1 or x = -4/3
(x+4/3)*(x-1) = 0
-7/((x+4/3)*(x-1)) = 0
x belongs to the empty set
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