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D( x )
4*x-3 = 0
4*x-3 = 0
4*x-3 = 0
4*x-3 = 0 // + 3
4*x = 3 // : 4
x = 3/4
x in (-oo:3/4) U (3/4:+oo)
(16*x^2-(20*x)+9)/(4*x-3) = 0
(16*x^2-20*x+9)/(4*x-3) = 0
16*x^2-20*x+9 = 0
16*x^2-20*x+9 = 0
DELTA = (-20)^2-(4*9*16)
DELTA = -176
DELTA < 0
1 = 0
1/(4*x-3) = 0
x belongs to the empty set
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