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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x+10 = 28 // - 28
7/x-28+10 = 0
7*x^-1 = 18 // : 7
x^-1 = 18/7
-1 < 0
1/(x^1) = 18/7 // * x^1
1 = 18/7*x^1 // : 18/7
7/18 = x^1
x = 7/18
x = 7/18
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