Ta có : \(\dfrac{2^{x-3}}{4^{10}}=8^3\rightarrow2^{x-3}:4^{10}=8^3\)
\(\Rightarrow2^{x-3}:\left(2^2\right)^{10}=\left(2^3\right)^3\)
\(\Rightarrow2^{x-3}:2^{20}=2^9\)
\(\Rightarrow\)\(2^{x-3-20}=2^9\)
=> \(x-3-20=9\)
=> \(x-3=20+9=29\)
=> \(x=29+3=32\)
Vậy x= 32