Why is it important to be able to remove parentheses

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Please Excuse My Dear Aunt Sally for Looking Rough and P - E - M - D - A - S are mnemonic devices for what? What do the underlines help remind you to do in P - E - M - D - A - S? Why is it important to be able to remove parentheses? Why is it important to be able to combine like terms? Provide examples that illustrate both of these processes.

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