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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.30526989 = (x+1)/x // - (x+1)/x
1.30526989-((x+1)/x) = 0
(-1*(x+1))/x+1.30526989 = 0
(-1*(x+1))/x+(1.30526989*x)/x = 0
1.30526989*x-1*(x+1) = 0
0.30526989*x-1 = 0
(0.30526989*x-1)/x = 0
(0.30526989*x-1)/x = 0 // * x
0.30526989*x-1 = 0
0.30526989*x-1 = 0 // + 1
0.30526989*x = 1 // : 0.30526989
x = 1/0.30526989
x = 3.27578983
x = 3.27578983
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