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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/7 = 5/x // - 5/x
12/7-(5/x) = 0
12/7-5*x^-1 = 0
-5*x^-1 = -12/7 // : -5
x^-1 = 12/35
-1 < 0
1/(x^1) = 12/35 // * x^1
1 = 12/35*x^1 // : 12/35
35/12 = x^1
x = 35/12
x = 35/12
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