-\frac{8}{6} + \frac{75}{6} - \frac{193}{6} + d = 3 \Rightarrow \frac{-8 + 75 - 193}{6} + d = 3 \Rightarrow \frac{-126}{6} + d = 3 \Rightarrow -21 + d = 3 \Rightarrow d = 24