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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-12 = -20/x // + -20/x
X-(-20/x)-12 = 0
X+20*x^-1-12 = 0
20*x^-1 = -(X-12) // : 20
x^-1 = (12-X)/20
-1 < 0
1/(x^1) = (12-X)/20 // * x^1
1 = x^1*((12-X)/20) // : (12-X)/20
20*(12-X)^-1 = x^1
x = 20*(12-X)^-1
x = 20*(12-X)^-1
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