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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/4 = 12/x-5 // - 12/x-5
3/4-(12/x)+5 = 0
3/4-12*x^-1+5 = 0
-12*x^-1 = -23/4 // : -12
x^-1 = 23/48
-1 < 0
1/(x^1) = 23/48 // * x^1
1 = 23/48*x^1 // : 23/48
48/23 = x^1
x = 48/23
x = 48/23
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