What is 2 to the power of 30 divided by eight to the power of nine equals to 2 to the power of X. Working must be shown pls

$$\frac{2^{30}}{8^9}\rightarrow\frac{2^{30}}{(2^3)^9}\rightarrow\frac{2^{30}}{2^{27}}\rightarrow2^{30-27}\rightarrow2^3$$

so x = 3

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