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7 November, 16:09

6x + 9 = 18x - 3x + 81

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  1. 7 November, 16:20
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    6x + 9 = 18x - 3x + 81

    6x + 18x + 3x = - 9 + 81

    -9x = 72

    x = 72 : (-9)

    = - 8
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