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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
g = (x-c)/x // - (x-c)/x
g-((x-c)/x) = 0
(-1*(x-c))/x+g = 0
(-1*(x-c))/x+(g*x)/x = 0
g*x-1*(x-c) = 0
c+g*x-x = 0
c+g*x-x = 0
c+g*x = 0 // - c
g*x = -c // : g
x = -c/g
x = -(c*g^-1)
c*g^-1+x = 0
(c*g^-1+x)/x = 0
(c*g^-1+x)/x = 0 // * x
c*g^-1+x = 0
c*g^-1+x = 0 // - c*g^-1
x = -(c*g^-1)
x = -(c*g^-1)
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