To solve this expression, we need to find a common denominator for the fractions. The least common multiple of 36 and 27 is 108.

So, we can rewrite the expression as:

(-118/36) - (-33/27) = (-118/36) - (-33/27) * (4/4) = (-118/36) - (-132/108)

Now, we can subtract the fractions:

(-118/36) - (-132/108) = (-118/36) + (132/108)

To add the fractions, we need to find a common denominator. The least common multiple of 36 and 108 is 108.

So, we can rewrite the expression as:

(-118/36) + (132/108) = (-118/36) * (3/3) + (132/108) * (1/1) = (-354/108) + (132/108)

Now, we can add the fractions:

(-354/108) + (132/108) = (-354 + 132)/108 = -222/108

Finally, we can simplify the fraction:

-222/108 = -37/18