Let's start by evaluating the parenthesis on the right. Because of the order of operations (PEMDAS - parenthesis, exponents, multiplication/division, addition/subtraction), we divide 3 by 1/8 first. This is equal to multiplying 3 * 8, or 24. Next, we subtract 5 from 24. This is equal to 19.
Next, we subtract 19 from 3/4. -18 1/4 We complete this problem by adding (1/2)^2, or 1/4. This is: -18 1/4 + 1/4 = -18, so -18 is the answer.