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D( x )
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
(4*x^2+2*x+12)/(2*x-3) = 0
4*x^2+2*x+12 = 0
2*(2*x^2+x+6) = 0
2*x^2+x+6 = 0
DELTA = 1^2-(2*4*6)
DELTA = -47
DELTA < 0
2 = 0
2/(2*x-3) = 0
x belongs to the empty set
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