-[8a²-{7a²-[6a²-(5a²-a²+8)]}]
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Step-by-step explanation:
-[8a²-{7a²-[6a²-4a²+8]}]
-8a²-[7a²-2a²+8]
-8a²-5a²+8
-13a² = -8
a²=8/13
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