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26 November, 23:39

3 (f+2) + 9=13+f+4f find f

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  1. 26 November, 23:53
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    F=1

    3 (f+2) + 9=13+f+4f

    3f+6+9=13+5f

    3f+15=13+5f

    3f-3f+15=13+5f-3f

    15=13+2f

    15-13=13-13+2f

    2=2f

    F=1
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