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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/7 = 10/x // - 10/x
18/7-(10/x) = 0
18/7-10*x^-1 = 0
-10*x^-1 = -18/7 // : -10
x^-1 = 9/35
-1 < 0
1/(x^1) = 9/35 // * x^1
1 = 9/35*x^1 // : 9/35
35/9 = x^1
x = 35/9
x = 35/9
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