First turn the last fraction into a mixed number:
-1 1/6 = -7/6
Then you need to convert the first two fractions into x/6 format so you can work with them:
-1/2 = -3/6
2/3 = 4/6
Then you can place it into one fraction:
(-3+4+-7)/6 = -6/6 = -1
Hope this helps! :)
