Answer:
7.2b+−8.1
Step-by-step 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
