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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x-4)*(5/x-(1/2)) = 0
(3*x-4)*(5/x-1/2) = 0
(3*x-4)*(5*x^-1-1/2) = 0
( 3*x-4 )
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
( 5*x^-1-1/2 )
5*x^-1 = 1/2 // : 5
x^-1 = 1/10
-1 < 0
1/(x^1) = 1/10 // * x^1
1 = 1/10*x^1 // : 1/10
10 = x^1
x = 10
x in { 4/3, 10 }
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