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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x-3)/x+4 = x-(3/x) // - x-(3/x)
(2*x-3)/x-x+3/x+4 = 0
(2*x-3)/x+(-x*x)/x+3/x+(4*x)/x = 0
2*x-x*x+4*x-3+3 = 0
2*x-x^2+4*x-3+3 = 0
2*x-x^2+4*x = 0
6*x-x^2 = 0
6*x-x^2 = 0
x*(6-x) = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x*(x-6) = 0
(x*(x-6))/x = 0
(x*(x-6))/x = 0 // * x
x*(x-6) = 0
( x-6 )
x-6 = 0 // + 6
x = 6
( x )
x = 0
x in { 0}
x = 6
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