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\(13a\)
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Let's break it down! First, we combine the like terms: 11a - 13a + 15a. If we do the math, we have (11 - 13 + 15)a = (11 + 15 - 13)a = 13a. So, the simplified expression is 13a! Now, here's a fun little twist: think of "a" as a superhero! You got 11 heroes joining the fight, 13 deciding to take a nap, and then 15 jumping in to save the day! In the end, you've got a total of 13 superheroes ready to battle together!
