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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-(3/2) = 13/4 // - 13/4
7/x-(3/2)-(13/4) = 0
7/x-3/2-13/4 = 0
7*x^-1 = 19/4 // : 7
x^-1 = 19/28
-1 < 0
1/(x^1) = 19/28 // * x^1
1 = 19/28*x^1 // : 19/28
28/19 = x^1
x = 28/19
x = 28/19
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