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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = -3/4 // + -3/4
2/x-(-3/4) = 0
2/x+3/4 = 0
2*x^-1 = -3/4 // : 2
x^-1 = -3/8
-1 < 0
1/(x^1) = -3/8 // * x^1
1 = -3/8*x^1 // : -3/8
-8/3 = x^1
x = -8/3
x = -8/3
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