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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/4 = 5/x-2 // - 5/x-2
7/4-(5/x)+2 = 0
7/4-5*x^-1+2 = 0
-5*x^-1 = -15/4 // : -5
x^-1 = 3/4
-1 < 0
1/(x^1) = 3/4 // * x^1
1 = 3/4*x^1 // : 3/4
4/3 = x^1
x = 4/3
x = 4/3
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