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D( x )
x/2 = 0
x/2 = 0
x/2 = 0
1/2*x = 0 // : 1/2
x = 0
x in (-oo:0) U (0:+oo)
a = y/(x/2) // - y/(x/2)
a-(y/(x/2)) = 0
a-2*x^-1*y = 0
-2*x^-1*y = -a // : -2*y
x^-1 = (1/2)*a*y^-1
-1 < 0
1/(x^1) = (1/2)*a*y^-1 // * x^1
1 = (1/2)*a*x^1*y^-1 // : (1/2)*a*y^-1
2*a^-1*y = x^1
x = 2*a^-1*y
x = 2*a^-1*y
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