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16 September, 11:42

Explain how to simplify this expression: (7a + 9) + (4a - 7).

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  1. 16 September, 15:35
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    Remember, here - - with addition - - the parentheses are just extras there to throw you off track!

    We can remove the parentheses:

    7a + 9 + 4a - 7

    Now simplify!

    7a + 4a + 9 - 7

    11a + 2
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