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23 January, 17:17

7 + 5r + 3 + 5 = 1 + 7r

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  1. 23 January, 17:30
    0
    7+5r+3+5=1+7r

    15+5r=1+7r

    -5r=-5r

    15=1+2r

    -1=-1

    14=2r

    7=r
  2. 23 January, 17:34
    0
    7+5r+3+5=1 + 7r

    15+5r=1+7r

    14=2r

    r=7
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