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