Question

log x 7 + 2 log x 7 = 3

Answer 1

log x 7 + 2 log x 7  = 3 log x 7 = 3

3 log x 7 = 3

log x 7 = 1

x = 7

Answer 2

$log_{x}(7) + 2 log_{x}(7) = 3 \\ 3 log_{x}(7) = 3 \\ log_{x}(7) = 1 \\ 7 = {x}^{1} \\ x = 7$