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D( x )
x = 0
4*x-3 = 0
x = 0
x = 0
4*x-3 = 0
4*x-3 = 0
4*x-3 = 0 // + 3
4*x = 3 // : 4
x = 3/4
x in (-oo:0) U (0:3/4) U (3/4:+oo)
16/(4*x-3) = 4/x // - 4/x
16/(4*x-3)-(4/x) = 0
16/(4*x-3)-4*x^-1 = 0
16/(4*x-3)-4/x = 0
(16*x)/(x*(4*x-3))+(-4*(4*x-3))/(x*(4*x-3)) = 0
16*x-4*(4*x-3) = 0
12 = 0
12/(x*(4*x-3)) = 0
12/(x*(4*x-3)) = 0 // * x*(4*x-3)
12 = 0
x belongs to the empty set
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