algebra

5r-4s=8 4r+5s=31

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  1. 5r-4s=8
    4r+5s=31

    25r - 20s = 40 (the first equation x5)
    16r + 20s = 124 (the second equation x4)

    41r = 164 (adding the last 2 equations)
    r = 4

    4s = 5r -8 = 20 -8 = 12
    s = 3

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