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