Respuesta :

-5-r=1+2r
-r-2r=1+5
-3r=6
r=-2
-5-r=1+2r
Add your r to both sides of the equal sign
-5=1+3r
Subtract your 1 on both sides of the equal sign
-6=3r
Divide your 3 on both sides of the equal sign 
-2=r       
HOPE THIS HELPS YOU! ^_^