Respuesta :

4d + 6 = 42
4d + 6 - 6 = 42 - 6
4d = 36
d = 9

[tex]4d + 6 = 42 \\ \\ 4d = 42 - 6 \\ \\ 4d = 36 \\ \\ d = \frac{36}{4} \\ \\ d = 9 \\ \\ Answer: \fbox {d = 9}[/tex]