Solve for d 4d + 6 = 42
4d + 6 = 424d + 6 - 6 = 42 - 64d = 36d = 9
\(4d + 6 = 42 \\ \\ 4d = 42 - 6 \\ \\ 4d = 36 \\ \\ d = \frac{36}{4} \\ \\ d = 9 \\ \\ Answer: \fbox {d = 9}\)