Hello there!
Question:-

We need to find the value of x.
Solution:-

Firstly, Over turn the equation:-

Then Add 12 g to both sides:-

This equation may be rewritten as :-

On Simplification:-
As (-) and (+) equals to (-),


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Henceforth,the value of x is :-

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Please let me know if you have any questions.
~MisterBrian