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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 0.03 // - 0.03
8/x-0.03 = 0
8*x^-1 = 0.03 // : 8
x^-1 = 0.00375
-1 < 0
1/(x^1) = 0.00375 // * x^1
1 = 0.00375*x^1 // : 0.00375
266.66666667 = x^1
x = 266.66666667
x = 266.66666667
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