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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#