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Solve each of the following equations:
(a) `9^(4x)÷3^(2x)=2187`

(b) `(5^(2c) )^3=(5^4 )^c×625`

(c)`2^(x/4)=8`

(d)`3^((2x-5))=27`

(e)`3^(4x)÷3^(-7)=3^15`

(f) `2×3^x=162`