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Solve each of the following equations:
(a) `(3^(2x) )^4=81`

(b) `4^(5x)÷(2^(3x ))^2=256`

(c) `9^(2x)=729`

(d) `2^(8x)=512`

(e) `(7^4 )^(2x)=(7^4 )^3`

(f) `(5^3 )^a×(5^8 )^a= 5^72`