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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(6/y) = -3 // + 3
2/x-(6/y)+3 = 0
2/x-6*y^-1+3 = 0
2*x^-1 = -(3-6*y^-1) // : 2
x^-1 = (-(3-6*y^-1))/2
-1 < 0
1/(x^1) = (-(3-6*y^-1))/2 // * x^1
1 = x^1*((-(3-6*y^-1))/2) // : (-(3-6*y^-1))/2
-2*(3-6*y^-1)^-1 = x^1
x = -2*(3-6*y^-1)^-1
x = -2*(3-6*y^-1)^-1
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