Answer:
[tex]\boxed{\sf{a<21}}[/tex]
Step-by-step explanation:
You only need to isolate the term a to solve this problem.
Add by 3 from both sides.
[tex]\sf{\dfrac{a}{7}-3+3<0+3}[/tex]
Solve.
0+3=3
a/7<3
Multiply by 7 from both sides.
[tex]\sf{\dfrac{7a}{7}<3*7}[/tex]
Solve.
3*7=21
a<21
As a result, the solution is a<21, which is our answer.
