You should be able to use parentheses in the same order in which you would write the arithmetic expression. For example, 4*(3.5-1.5)= should give you 8. Without the parentheses, this would 12.5.
Essentially, the left parenthesis comes immediately after an arithmetic operator, and the right parenthesis must close the parenthetical expression right after a number, and an operator must follow the right parenthesis.
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