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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
M = y-(b/x) // - y-(b/x)
M+b/x-y = 0
b*x^-1 = -(M-y) // : b
x^-1 = (y-M)/b
-1 < 0
1/(x^1) = (y-M)/b // * x^1
1 = x^1*((y-M)/b) // : (y-M)/b
1/((y-M)/b) = x^1
x = 1/((y-M)/b)
x = 1/((y-M)/b)
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