Answer:
[tex]23r-12y+15[/tex]
Step-by-step explanation:
[tex]18r + 6 - 12y + 5r + 9[/tex]
Group the similar terms together:
[tex]18r+5r-12y+6+9[/tex]
Add the variable "r":
[tex]23r-12y+6+9\\[/tex]
Add the numbers:
