Answer:
7.2b+−8.1
Explanation:
6.1b−8.1−1.6b+2.7b
=6.1b+−8.1+−1.6b+2.7b
=6.1b−8.1−1.6b+2.7b
=(6.1b−1.6b+2.7b)+(−8.1)
=7.2b+−8.1
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