Respuesta :

R would equal -4. Subtract 7 from each side & youll get -12=3r then divide each side by 3.
Hi!

-5 = 7+3r

-5-3r = 7+3r-3r

-5-3r = 7

-5-3r+5 = 7+5

-3r = 12

-3r    12
▬ =  ▬
-3      -3

r= -4