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6 February, 12:47

Solve 2a + 21 = 8a - 9, step by step

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  1. 6 February, 13:35
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    2a + 21 = 8a - 9

    Combine like terms.

    2a + 21 = 8a - 9

    -2a - 2a

    21 = 6a - 9

    +9 + 9

    30 = 6a

    6a/6 = 30/6

    a = 5

    Answer: a = 5
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