Answer:
[tex]x<6[/tex]
All real numbers less than [tex]6[/tex]
Step-by-step explanation:
we have
[tex]5x-9<21[/tex]
Adds [tex]9[/tex] both sides
[tex]5x-9+9<21+9[/tex]
[tex]5x<30[/tex]
Divide by [tex]5[/tex] both sides
[tex]x<6[/tex]
the solution is the interval ---------> (-∞,6)
All real numbers less than [tex]6[/tex]
see the attached figure to better understand the problem
