You are given a value for x within an equation and told that you need to work out the answer by trial and improvement. What is the first thing you do?

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Trial and Improvement involves intelligent guesswork. We use this method in algebra to work out the value of a letter when there is no obvious other way.
 


You are given a value for x within an equation and told that you need to work out the answer by trial and improvement. What is the first thing you do?