Solving chemical equation. Need to solve for x but got stuck.

What did you attempt?
Why do you think you're stuck?
Are you SURE that's the right equation? Whence came it?
 
[MATH] If \dfrac{a}{b} = c, \ then \ \dfrac{a}{c}=b! [/math]
That is you can interchange the b and c. That should help in your problem. Please post back with your work.
 
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