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log_4 4x-2log_4 5=2
ОДЗ 4х>0 x>0
log_4 4x-log_4 5^2=log_4 4^2
log_4 (4x/25) = log_4 16
4x/25=16
4x=16*25
x=16*25/4
x=100
Ответ. (0; 100]