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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19/x = -10 // + 10
19/x+10 = 0
19*x^-1 = -10 // : 19
x^-1 = -10/19
-1 < 0
1/(x^1) = -10/19 // * x^1
1 = -10/19*x^1 // : -10/19
-19/10 = x^1
x = -19/10
x = -19/10
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