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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/20 = -2/x // + -2/x
10/20-(-2/x) = 0
2*x^-1+10/20 = 0
2*x^-1 = -1/2 // : 2
x^-1 = -1/4
-1 < 0
1/(x^1) = -1/4 // * x^1
1 = -1/4*x^1 // : -1/4
-4 = x^1
x = -4
x = -4
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