4) log3 (7-4x) <=3
log3 (7-4x)<= log3 27
7-4x<=27
-4x<=27-7
-4x<=20
x>=-5
ОДЗ: 7-4х>0
-4x>-7
x<7/4
ответ: [-5; 7/4)
4) log3 (7-4x) <=3
log3 (7-4x)<= log3 27
7-4x<=27
-4x<=27-7
-4x<=20
x>=-5
ОДЗ: 7-4х>0
-4x>-7
x<7/4
ответ: [-5; 7/4)