Find the sum of (12ab – 6a – b) and (7ab – 11la – 8b) and subtract (6ab + a – b) from
the sum.
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The sum of (12ab – 6a – b) and (7ab – 11la – 8b) is
(12ab – 6a – b) + (7ab – 11la – 8b) = 19ab - 17a - 9b.
and (19ab - 17a - 9b) - (6ab + a – b) = 10ab- 16a - 8b.
Hence final answer is 10ab- 16a - 8b.
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