Verified answer

log9(x+3)=log9(2x-16)

x+3=2x-16

(x+3)>0    x>-3

(2x-16)>0   x>8

x= 19

2) (1/4)^(x-11)=2

(2^-2)^(x-11)=2^1

-2(x-11)=1

x-11=-0,5

x=10,5

3)корень из( 2х+7)=5

2х+7=25

2x=18

x=9