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Parentheses Parentheses are used for groupings exactly as they would be in traditional mathematics. For example, take this equation line: R/(a*2) By putting a*2 in parentheses, it will be evaluated first before being divided by R. The statement as written describes the following (a*2)/R, that incidentally does not need parenthesis as multiplication and division have the same priority and the left to right rule applies. The words in Bold are incorrect. The example R/(a*2) has a*2 calculated first and then divided into R.