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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
33.33/100 = 12/x // - 12/x
33.33/100-(12/x) = 0
33.33/100-12*x^-1 = 0
-12*x^-1 = -0.3333 // : -12
x^-1 = 0.027775
-1 < 0
1/(x^1) = 0.027775 // * x^1
1 = 0.027775*x^1 // : 0.027775
36.00360036 = x^1
x = 36.00360036
x = 36.00360036
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