2a(a+b+c) from 7a(3a-2b-c)
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7a(3a-2b-c) -{2a(a+b+c)}
21a²-14ab-7ac-2a²-2ab-2ac
21a²-2a²-14ab-2ab-7ac-2ac
19a²-16ab-9ac
a(19a-16b-9c)
Hope this helps you friend
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