[tex] \large\boxed{\begin{array}{l} \rm \dfrac{x - 3}{6} = \dfrac{5}{2} \\ \\ \rm \: 2(x - 3) = 5 \cdot6 \\ \\ \rm \: 2x - 6 = 30 \\ \\ \rm \: 2x = 30 + 6 \\ \\ \rm \: 2x = 36 \\ \\ \rm \: x = \dfrac{36}{2} \\ \\ \boxed{ \boxed{ \rm{x = 18}}} \leftarrow \textsf{Letra D}\end{array}}[/tex]
