(ESPCEX) O valor de x na equação exponencial (7^2x-1) - (7^x) - (7^x-1) = 0 é:?

a) (2 log 2)/ log 7

b) (3 log 3)/log 7

c) (2 log 3)/log 7

d) (3 log 2)/log 7

e) (3 log 8)/log 7

Gabarito: D

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