30 - [15 - {8 - (6 - 8 - 7)}] + 14 ÷ 7 and there is a bar at 8 - 7.

= 30 – [15 – {8 – (6 – (8 – 7))}] + 14 / 7

= 30 – [15 – {8 – (6 – (1))}] + 14 / 7

= 30 – [15 – {8 – (6 – 1)}] + 14 / 7

= 30 – [15 – {8 – (5)}] + 14 / 7

= 30 – [15 – {8 – 5}] + 14 / 7

= 30 – [15 – {3}] + 14 / 7

= 30 – [15 – 3] + 14 / 7

= 30 – [12] + 14 / 7

= 30 – 12 + 14 / 7

= 30 – 12 + 2

= 18 + 2

= 20

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