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29 December, 14:09

What is 5a - (-2a) + 9 simplified

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  1. 29 December, 14:18
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    Negative times negative is positive so it makes it 7a + 9 since it's out of the parentheses
  2. 29 December, 14:33
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    5a - (-2a) + 9

    When you subtract a negative number, you can replace the 'double negative' with a positive, or addition. So, instead of subtracting - 2a, you can add 2a.

    5a + 2a + 9 Combine like-terms

    7a + 9
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