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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
480 = 12/x // - 12/x
480-(12/x) = 0
480-12*x^-1 = 0
-12*x^-1 = -480 // : -12
x^-1 = 40
-1 < 0
1/(x^1) = 40 // * x^1
1 = 40*x^1 // : 40
1/40 = x^1
x = 1/40
x = 1/40
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