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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
w = (3*x-s)/x // - (3*x-s)/x
w-((3*x-s)/x) = 0
(-1*(3*x-s))/x+w = 0
(-1*(3*x-s))/x+(w*x)/x = 0
w*x-1*(3*x-s) = 0
s+w*x-3*x = 0
s+w*x-3*x = 0
s+w*x = 0 // - s
w*x = -s // : w
x = -s/w
x = -(s*w^-1)
s*w^-1+x = 0
(s*w^-1+x)/x = 0
(s*w^-1+x)/x = 0 // * x
s*w^-1+x = 0
s*w^-1+x = 0 // - s*w^-1
x = -(s*w^-1)
x = -(s*w^-1)
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