The common denominator for these fractions is 138.

1/2 + 1/2 + 6/138 + 23/138

Simplifying the first two fractions:

1 + 1 = 2

Combining the last two fractions:

6/138 + 23/138 = 29/138

Putting it all together:

2 + 29/138

To add these fractions, we need a common denominator:

2 * 138/138 + 29/138 = 277/138

Simplifying:

277/138 = 2

Therefore, 1/2 + 1/2 + 1/23 + 1/6 = 2.