Answer:
a = 3
Step-by-step explanation:
1) Simplify 5a - 9 + a to 6a - 9.
[tex]6a - 9 = 9[/tex]
2) Add 9 to both sides.
[tex]6a = 9 + 9[/tex]
3) Simplify 9 + 9 to 18.
[tex]6a = 18[/tex]
4) Divide both sides by 6.
[tex]a = \frac{18}{6} [/tex]
5) Simplify 18/6 to 3.
[tex]a = 3[/tex]
Therefor, the answer is, a = 3.