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6 March, 12:25

12a-7b - (4a-21b) = ...

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  1. 6 March, 13:21
    0
    12a-7b - (4a-21b) distribute

    12a-7b-4a+21b combine like terms

    8a+14b

    This is my best try. That's how I would do it.
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