Answer:4 1/2Step-by-step explanation:Look at this expression as given in the original problem; the numbers, properly typewritten, are -5 1/2, - 4 1/4, + 6 3/4.We want to combine these three numbers into one.To do this, we need the LCD; it is 4.Thus, -5 1/2 is rewritten as -5 2/4.Then we have -5 2/4 - 4 1/4 + 6 3/4 = -5 -4 + 6 + 2/4 + 1/4 + 3/4.This simplifies to: +3 + 6/4, or 3 + 1 + 2/4, or 4 1/2