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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(1/4) = 1/3 // - 1/3
3/x-(1/4)-(1/3) = 0
3/x-1/4-1/3 = 0
3*x^-1 = 7/12 // : 3
x^-1 = 7/36
-1 < 0
1/(x^1) = 7/36 // * x^1
1 = 7/36*x^1 // : 7/36
36/7 = x^1
x = 36/7
x = 36/7
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