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ctc

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3r-2s=11
2r+3s=29

  • ctc -

    6 r - 4 s = 22
    6 r + 9 s = 87
    --------------
    0 - 13 s = - 65

    s = 65/13 = 5

    r = (11 +2*5)/3 = 7

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