Chapter 2 - Solving Equations - 2-3 Solving Multi-Step Equations - Practice and Problem-Solving Exercises - Page 98: 48

$d=28 $

The quantity inside of the parenthesis is being multiplied by 1/4. Thus, we first multiply both sides by 4/1 (the reciprocal of 1/4) to find that $16=d-12$. We now need to get the d alone. Thus, we cancel out the subtraction by adding 12 on both sides. Thus, we obtain that $d=28$.