-5a-[2a+3(a-7)-6a^2]
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Answered by
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Answer: 6a-10a+21
Step-by-step explanation:
-5a(2a+3a-21-6a^2)
-5a-(5a-21-6a^2)
-5a-5a+21+6a^2
-10a+21+6a^2
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