What is the equivalent of 3:7 1 × 22:21 × (3:7 1-7:3 1) × (- 22:7)

3 and 7 of 1 × 22 of 21 × (3 and 7 of 1-7 and 3 of 1) × (- 7 of 22)
=22 / 7 × 21 / 22 × (22 / 7-22 / 3) × (- 7 / 22)
=3 × (22 / 3-22 / 7) × 7 / 22
=3 × 3 / 22x22 / 7-3 × 7 / 22x22 / 7
=7-3
=4

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