What's 2 out of 5 plus 4 out of 7 minus 2 out of 5 plus 1 out of 7,

2 / 5 + 4 / 7 - 2 / 5 + 1 / 7
= (2 / 5-2 / 5) + (4 / 7 + 1 / 7)
= 0 + 5 / 7
= 5 / 7

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