12x-35y = 25

12x-35y = 25

  • {12x-35y = 25
    {-8x-15y = -55

    20x-20y = 80

    x-y = 4

    x = y + 4

    12 (y + 4) -35y = 25

    12y + 48-35y = 25

    -23y = -23

    y = 1

    x = 1 + 4 = 5

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