What is the value of a?

Answer:
a= 2x (edit: i just forgot it should be a integer x.x, forgive my blondiness)
Step-by-step explanation:
usually when doing equations like that, you can separate one of the parenthesis with 0
(in this case, we will use (2x-a) )
Then create a equation, which should look like:
2x-a=0
Then solve for a
[tex](-2x)2x-a=0(-2x)\\(-1)-a=-2x (-1) \\a=2x[/tex]