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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/160 = 4.5/x // - 4.5/x
6/160-(4.5/x) = 0
6/160-4.5*x^-1 = 0
-4.5*x^-1 = -3/80 // : -4.5
x^-1 = 0.00833333
-1 < 0
1/(x^1) = 0.00833333 // * x^1
1 = 0.00833333*x^1 // : 0.00833333
120.000048 = x^1
x = 120.000048
x = 120.000048
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