7. \((d^4)^5:(d^4)^2\)

\((d^4)^5=d^{20}\), \((d^4)^2=d^8\).

\((d^4)^5:(d^4)^2=d^{20}:d^8=d^{20-8}=d^{12}\).

Ответ: \(d^{12}\)