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I can't figure out for a question for math connections academy for number 16 page 542, I don't know how to solve The price of shoes decreases $21 over 7 days what do I need to do to solve can you help me

hello, that would equal 3 2/5 because if you start with x + 4 2/5 = 7 4/5 you would need to put it like this (7 – 4) + (4/5 -2/5) then you subtract 7 - 4 which would equal 3 so then you add 4/5 which would be 3.8, so 3.8 - 2/5 which is 3.4

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