Tìm x

Tìm x, biết :
$$\begin{gathered} a) 2^{-2}.2^{x } + 2.2^{x }= 9.2^6 \\ b) {(x + 1,5)}^2 + {(y - 2,5)}^{10} = 0 \\ c) 3^{-22}.3^4.3^x = 3^7 \end{gathered}$$

(GIUP MINH VOI, LAM ON)