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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+2*y = 3 // - 3
1/x+2*y-3 = 0
1*x^-1 = -(2*y-3) // : 1
x^-1 = 3-(2*y)
-1 < 0
1/(x^1) = 3-(2*y) // * x^1
1 = x^1*(3-(2*y)) // : 3-(2*y)
1/(3-2*y) = x^1
x = 1/(3-2*y)
x = 1/(3-2*y)
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