Log4 108 - log4 9 = log4 (7a-9)

Question

_{I really don’t understand this quest so I want you to help me ?}

Answer 1

log4 108 -log 4 9 = log (7a-9)

log4 (108/9) = log 4(7a-9)

log 4(12) =  log4 (7a-9)

12= 7a -9

21 = 7a

3=a