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1 June, 17:03

9=7x-13x-21 show step by step

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  1. 1 June, 18:53
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    First step is to combine like terms.

    9 = 7x - 13x - 21 becomes 9 = - 6x - 21

    Now add 21 to both sides to isolate our coefficient and variable.

    - 6x - 21 + 21 = 9 + 21

    The 21s on the left cancel out.

    - 6x = 30

    Now divide both sides by - 6 to isolate the variable.

    x = 30 / - 6

    x = - 5
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