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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/100 = 32/x // - 32/x
5/100-(32/x) = 0
5/100-32*x^-1 = 0
-32*x^-1 = -1/20 // : -32
x^-1 = 1/640
-1 < 0
1/(x^1) = 1/640 // * x^1
1 = 1/640*x^1 // : 1/640
640 = x^1
x = 640
x = 640
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