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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/8 = -30/x // + -30/x
2/8-(-30/x) = 0
30*x^-1+2/8 = 0
30*x^-1 = -1/4 // : 30
x^-1 = -1/120
-1 < 0
1/(x^1) = -1/120 // * x^1
1 = -1/120*x^1 // : -1/120
-120 = x^1
x = -120
x = -120
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