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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/120 = -9/x // + -9/x
24/120-(-9/x) = 0
9*x^-1+24/120 = 0
9*x^-1 = -1/5 // : 9
x^-1 = -1/45
-1 < 0
1/(x^1) = -1/45 // * x^1
1 = -1/45*x^1 // : -1/45
-45 = x^1
x = -45
x = -45
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