Explanation:
Work with what is in the brackets first
10a-[4{5a-3(a-1)} - 3(4a-3a+1)]
=10a-[4{5a-3a+1-12a+9a-3}]
=10a-[4{-a-2}]
=10a-[-4a-8]
=10a+4a+8
=14a+8
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