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Simplify the following:
2 (12/(3+1)+6)-1

3+1 = 4:
2 (6+12/4)-1

The gcd of 12 and 4 is 4, so 12/4 = (4×3)/(4×1) = 4/4×3 = 3:
2 (6+3)-1

6+3 = 9:
2×9-1

2×9  =  18:
18-1

| 1 | 8
- |  | 1
| 1 | 7:
Answer: | =17
 

2×{6+[12÷(3+1)]}-1  =

2*{6 +[ 12 / 4] } - 1  =

2* { 6 + 3}  - 1  =

2* {9}  - 1  =

18 - 1  =

17