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2013-08-25 13:19:53 +0200 received badge  Teacher (source)
2013-08-24 20:55:47 +0200 answered a question Implicit differentiation displays extraneous x variable.

Try this:

sage: g=function('g',x)
sage: var('y')
sage: temp=diff(9*x^(1/2) - 2*g^(3/5) - g)
sage: pretty=solve(temp,diff(g))[0].right().subs({g(x):y})
sage: show(pretty)