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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*4-((6/x)/12) = 0
(-1/2)*x^-1+3*4 = 0
-1/2*x^-1 = -12 // : -1/2
x^-1 = 24
-1 < 0
1/(x^1) = 24 // * x^1
1 = 24*x^1 // : 24
1/24 = x^1
x = 1/24
x = 1/24
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