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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-10 = 7/x // - 7/x
5/x-(7/x)-10 = 0
5/x-7*x^-1-10 = 0
-2*x^-1 = 10 // : -2
x^-1 = -5
-1 < 0
1/(x^1) = -5 // * x^1
1 = -5*x^1 // : -5
-1/5 = x^1
x = -1/5
x = -1/5
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