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Help with the most disgusting 'solve for x' question I have been given watch

1. (Original post by Gregorius)
If you feed this mess to FullSimplify in Mathematica it spits out
Just noticed that the result falls out of this expression, no need for Mathematica...
2. (Original post by Gregorius)
I get the required solution out (with a bit of help from Mathematica). If

then

If you set to be that mess on the RHS of the original equation, you get

If you feed this mess to FullSimplify in Mathematica it spits out

from which the result follows.
thanks for that.

but how did you go from the first eq to the second eq in your post?

And the last eq, if you divide both sides by A, how do you get yz/A^2?
3. (Original post by Et Tu, Brute?)
thanks for that.

but how did you go from the first eq to the second eq in your post?

And the last eq, if you divide both sides by A, how do you get yz/A^2?

etc etc.

Then

Now divide top and bottom by .
4. (Original post by Gregorius)

etc etc.

Then

Now divide top and bottom by .
finally I can see it!

Thanks, massive help from everyone here, appreciated.

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Updated: March 1, 2016
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