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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-2 = 16/x-3 // - 16/x-3
4/x-(16/x)-2+3 = 0
4/x-16*x^-1-2+3 = 0
-12*x^-1 = -1 // : -12
x^-1 = 1/12
-1 < 0
1/(x^1) = 1/12 // * x^1
1 = 1/12*x^1 // : 1/12
12 = x^1
x = 12
x = 12
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