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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+7/4+3 = 2 // - 2
2/x+7/4-2+3 = 0
2*x^-1 = -11/4 // : 2
x^-1 = -11/8
-1 < 0
1/(x^1) = -11/8 // * x^1
1 = -11/8*x^1 // : -11/8
-8/11 = x^1
x = -8/11
x = -8/11
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