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