Respuesta :

fwanah
(6r+7) + (13+7r) = 13r+20
(7r-3/2) - (2/3+6r) = r-13/6
aaviallis

Answer:

12-1/2r            =>  (13− 3/ 2 r)−(1−r)

r-13/6             =>  (7r-3/2)-(2/3+6r)

13r+20           =>  (6r+7)+(13+7r)

-12+r               =>  (−8−r)+(2r−4)

Step-by-step explanation: