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19 October, 19:09

From the sum of 3a²-a-3 and 2a-9, subtract a²-3a-7

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  1. 19 October, 20:05
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    The sum of 3a²-a-3 and 2a-9 is 3a²+a-12

    3a²+a-12 - (a²-3a-7) = 3a²+a-12 - a² + 3a + 7 =

    2a² + 4a - 5
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