(-1/2) + (-7/10) - (-3/5) - (8/15)

To simplify, find a common denominator to add and subtract the fractions:

Common denominator = 30

(-15/30) + (-21/30) - (18/30) - (16/30)

Combine like terms:

= (-54/30) - (18/30) - (16/30)

= -88/30

Simplify the fraction:

= -44/15

Therefore, the answer is -44/15.