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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/18 = -40/x // + -40/x
12/18-(-40/x) = 0
40*x^-1+12/18 = 0
40*x^-1 = -2/3 // : 40
x^-1 = -1/60
-1 < 0
1/(x^1) = -1/60 // * x^1
1 = -1/60*x^1 // : -1/60
-60 = x^1
x = -60
x = -60
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