simplify {_2/5} 7 ÷{_2/5}5
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(2/5) 7 ÷ (2/5) 5
= 2*7 / 5 ÷ 2*5 / 5
= 14 / 5 ÷ 10 / 5
= 14 / 5 ÷ 2
= 14 / 5 × 1 / 2
= 14 / 10
= 1.4
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