Answer:
-51a7
Step-by-step explanation:
Group Like terms for such questions, but the given are like, so don't bother.
In the question +(-25a7) basically means -25a7, because you always multiply what is outside the bracket to what's inside, but since the + is right outside, that's all you need to multiply. We know that + x - = -
Now, try:
-26a7 - 25a7 = -51a7
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