Tìm x biết: (7x-11)^3=2^5.5^2+200

$$\begin{gathered} tìm x biết \\ a, {( 7x - 11 )}^3 = 2^5 . 5^2 + 200 \\ b, {( 2x - 1 )}^4 = 81 \\ c, {( x + 2 )}^2 = 49 \\ d, {( 2x + 1 )}^2 = 121 \end{gathered}$$