42 = 2a +tb - 2c/3 - d/3, a + b + c + d = 58, a + b = 25, a >=0, b >= 0, c >= 0, d >= 0 - Wolfram|Alpha
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Input:

    link to /input/?i=2+a%2Bt+b-%282+c%29%2F3-d%2F3&lk=1&a=ClashPrefs_*Math-
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    Exact result:

    link to /input/?i=2+a-%282+c%29%2F3-d%2F3%2Bb+t&lk=1&a=ClashPrefs_*Math-
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    Solution:

    link to /input/?i=25-a&lk=1&a=ClashPrefs_*Math-link to /input/?i=33-c&lk=1&a=ClashPrefs_*Math-link to /input/?i=%28-159%2B6+a-c%29%2F%283+%28-25%2Ba%29%29&lk=1&a=ClashPrefs_*Math-
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    Number of integer solutions:

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