r+4.6+9=3r-11.7-7r
combine all like terms on one side of the equal sign
r+4.6-4.6+9=3r-11.7-7r-4.6
r+9-9=3r-11.7-7r-4.6-9
r-3r=3r-3r-11.7-7r-4.6-9
r-3r+7r=-11.7-4.6-9-7r+7r
r-3r+7r=-11.7-4.6-9
add them all into one term on each:
5r=-25.3
divide by 5 on both sides:
r= -5.06
