log₇(9-x)≥log₇8
ОДЗ: 9-x>0; -x>-9; x<9
9-x≥8
-x≥8-9
-x≥-1
x≤1
Ответ: x∈(-∞;1]
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log₇(9-x)≥log₇8
ОДЗ: 9-x>0; -x>-9; x<9
9-x≥8
-x≥8-9
-x≥-1
x≤1
Ответ: x∈(-∞;1]