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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
160/5 = 108/x // - 108/x
160/5-(108/x) = 0
160/5-108*x^-1 = 0
-108*x^-1 = -32 // : -108
x^-1 = 8/27
-1 < 0
1/(x^1) = 8/27 // * x^1
1 = 8/27*x^1 // : 8/27
27/8 = x^1
x = 27/8
x = 27/8
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