42/-6     +      -150/3

The given expression involves adding two fractions, 42/-6 and -150/3. To add fractions, we need to have a common denominator. In this case, the common denominator is 6. After finding the common denominator, we can add the numerators. The numerator of the first fraction is -42, and the numerator of the second fraction is -150. Adding these gives us -192. Therefore, the sum of the two fractions is -192/6, which simplifies to -32. Therefore, the answer is -32.