Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/solve-the-following-equation-by-trial-and-errormethod-5p/algebra/6002865
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https://www.meritnation.com/ask-answer/question/solve-the-following-equation-by-trial-and-errormethod-5p/algebra/6002865
Regards