Hello.
The answer is: −6ab+7a−8
Distribute the Negative Sign:
=2ab+7a+1+−1(8ab+9)
=2ab+7a+1+−1(8ab)+(−1)(9)
=2ab+7a+1+−8ab+−9
Combine Like Terms:
=(2ab+−8ab)+(7a)+(1+−9)
=−6ab+7a+−8
Have a nice day
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