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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+5/16 = 0
5*x^-1 = -5/16 // : 5
x^-1 = -1/16
-1 < 0
1/(x^1) = -1/16 // * x^1
1 = -1/16*x^1 // : -1/16
-16 = x^1
x = -16
x = -16
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