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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x+1 = 16/x // - 16/x
20/x-(16/x)+1 = 0
20/x-16*x^-1+1 = 0
4*x^-1 = -1 // : 4
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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