Answer:
r=-3
Step-by-step explanation:
the first step in this equation is to isolate 6r,to do this you got to add 12 to -30 which you get -18 which gives the equation 6r=-18 which now you got to divide both sides by 6 which you should get r=-3
add 12 to -30 you get -18 divide -18 by 6 and you get -3
