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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(6/x) = 2/3-(1/x)+3/4 // - 2/3-(1/x)+3/4
2/x-(6/x)+1/x-(2/3)-(3/4) = 0
2/x-6*x^-1+1/x-2/3-3/4 = 0
-3*x^-1 = 17/12 // : -3
x^-1 = -17/36
-1 < 0
1/(x^1) = -17/36 // * x^1
1 = -17/36*x^1 // : -17/36
-36/17 = x^1
x = -36/17
x = -36/17
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