[tex]\\ \sf\longmapsto 8r+9-4r-3r-8r[/tex]
[tex]\\ \sf\longmapsto 8r-4r-3r-8r+9[/tex]
[tex]\\ \sf\longmapsto -7r+9[/tex]
[tex]\\ \sf\longmapsto 9-7r[/tex]
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Here's the solution for You !
just combine the like terms :
