Answer:
[tex]a = - 6[/tex]
Step-by-step explanation:
1) Subtract 3a from both sides.
[tex]6 = 2a - 3a[/tex]
2) Simplify 2a - 3a to -a.
[tex]6 = - a[/tex]
3) Multiply both sides by -1.
[tex] - 6 = a[/tex]
4) Switch sides.
[tex]a = - 6[/tex]
So, therefor, the answer is, a = -6.