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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-((1/2)*y) = 0
2/x+(-1/2)*y = 0
2*x^-1 = -(-1/2*y) // : 2
x^-1 = 1/4*y
-1 < 0
1/(x^1) = 1/4*y // * x^1
1 = 1/4*x^1*y // : 1/4*y
4*y^-1 = x^1
x = 4*y^-1
x = 4*y^-1
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