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Kevin Arseneau · Answer 1 · 2018-12-28T11:29:49+0000

(4ab - 9a - 8) - (7ab - 1)
distribute (multiply) the negative through the parenthesis
(4ab - 9a - 8) - 7ab + 1
No need for other parenthesis because nothing in front or to combine inside.
4ab - 9a - 8 - 7ab + 1
Combine like terms
- 3ab - 9a - 7

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