If $a<b$, what is the value of $|a-b|+a+b$?

(Your answer can include $a$ and $b,$ and should be as simplified as possible.)
Question:
If $a<b$, what is the value of $|a-b|+a+b$?

(Your answer can include $a$ and $b,$ and should be as simplified as possible.)
Answer:
Let's think step by step.

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2b
If $a<b$, what is the value of $|a-b|+a+b$?

(Your answer can include $a$ and $b,$ and should be as simplified as possible.)
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