[ Answer ]
[tex]\boxed{2.4b \ + \ 4c}[/tex]
[ Explanation ]
-----------------------------------
-0.8b + 4.1c + 3.2b - 0.1c
-0.8b + 3.2b + 4.1c - 0.1c
2.4b + 4.1c - 0.1c
2.4b + 4c
[tex]\boxed{[ \ Eclipsed \ ]}[/tex]