One thing which might be confusing in this problem is the wording. "What is the evaluation of 2x+1" is just funky mathspeak for "what number is 2x+1 once you plug in x." To do this, we can solve the equation they give us, and then we'll plug in x.
Let me show you a similar example: Given that 3x  2 = 4(2x  2)  14, what is the evaluation of 3x + 2?
We'll start by solving for x:
3x  2 = 4(2x  2)  14
3x  2 = 8x  8  14
3x  2 = 8x  22
+22 +22
3x + 20 = 8x
3x 3x
20 = 5x
/5 /5
4 = x
Now we know that x is 4. Therefore, 3x+2 evaluates to 3(4) + 2, which is better known to its friends as 14.
Take home message: The phrase "evaluation" means "what number do you get when you plug in for all of the variables." Hopefully this is enough to help you make some progress. :)
10/21/2013

Simon S.