[(3/4-2/3) ÷1/4]×21
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Answer:
[(3/4-2/3)÷1/4]×21
[(9-8/12)÷1/4]×21
[1/12÷1/4]×21
[1/12×4/1]×21
[4/12]×21
1/3×21
21/3
=7
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