Question 1039401
You can't solve an expression, you can solve an equation. 
You can re-arrange it.
{{{C/D+2=C/D+2(D/D)}}}
{{{C/D+2=C/D+(2D/D)}}}
{{{C/D+2=(C+2D)/D)}}}
If this is not what you're looking for, please repost and clarify.