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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-10 = 12 // - 12
2/x-12-10 = 0
2*x^-1 = 22 // : 2
x^-1 = 11
-1 < 0
1/(x^1) = 11 // * x^1
1 = 11*x^1 // : 11
1/11 = x^1
x = 1/11
x = 1/11
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