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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 5/16 // - 5/16
2/x-(5/16) = 0
2/x-5/16 = 0
2*x^-1 = 5/16 // : 2
x^-1 = 5/32
-1 < 0
1/(x^1) = 5/32 // * x^1
1 = 5/32*x^1 // : 5/32
32/5 = x^1
x = 32/5
x = 32/5
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