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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/y-(6/x) = 12 // - 12
3/y-(6/x)-12 = 0
3/y-6*x^-1-12 = 0
-6*x^-1 = -(3*y^-1-12) // : -6
x^-1 = (12-(3*y^-1))/(-6)
-1 < 0
1/(x^1) = (12-(3*y^-1))/(-6) // * x^1
1 = x^1*((12-(3*y^-1))/(-6)) // : (12-(3*y^-1))/(-6)
-6*(12-3*y^-1)^-1 = x^1
x = -6*(12-3*y^-1)^-1
x = -6*(12-3*y^-1)^-1
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