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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-5 = 9/x+3 // - 9/x+3
7/x-(9/x)-5-3 = 0
7/x-9*x^-1-5-3 = 0
-2*x^-1 = 8 // : -2
x^-1 = -4
-1 < 0
1/(x^1) = -4 // * x^1
1 = -4*x^1 // : -4
-1/4 = x^1
x = -1/4
x = -1/4
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