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#