6а +2b +8с,- 6Ь - 2a + 4c and -8c -2a -ЗЬ
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where is question of this
AndI did like this
6a+2b+8c
-2a-6b+4c
=4a-4b+12c
4a-4b+12c
-2a-3b-8c
=2a-7b+4c
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