How much is 4 out of 5 plus 7 out of 9 minus (1 out of 5 plus 7 out of 9), We should use a simple method to calculate,

4 out of 5 plus 7 out of 9 minus (1 out of 5 plus 7 out of 9)
= 4/5 + 7/9 - 1/5 - 7/9
= 4/5 - 1/5 + (7/9 -7/9)
= 3/5
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