1/2log (5-7x) > 2 help

(1/2)log (5 - 7x) > 2
(1/2)log (5 - 7x) > (1/2)log(1/2)^2
(1/2)log (5 - 7x) > (1/2)log (1/4)
(5 - 7x) < 1/4 ........ kedua ruas kali 4
20 - 28x < 1
-28x < -19
x > 19/28

Syarat : (5 - 7x) > 0
=> -7x > -5
=> x < 5/7

Irisan : x > 19/28 dengan x < 5/7 adalah
= 19/28 < x < 5/7