Answer:
x < 6
Explanation:
Given
5x - 9 < 21 ( add 9 to both sides )
5x < 30 ( divide both sides by 5 )
5x-9<21
Add 9 to each side
5x-9+9<21+9
5x < 30
Divide by 5
5x/5 < 30/5
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