-c +4d
Step-by-step explanation:
[tex]8c - 4d + 8d + 9c - 18c[/tex]
Group like terms and simplify
[tex]8c + 9c - 18c - 4d + 8d \\ - c + 4d[/tex]
Answer:
collect like terms
8 c - 18 c+9c + 8d - 4d
17 c - 18 c + 4d
-1 c + 4d which is similar to 4d - 1c
