Respuesta :

How we gonna show our work

Answer:

R=51

Step-by-step explanation:

6x-9+7x=121

add like terms:6x+7x=13x

13x-9=121

to cancel out (-9) and to isolate x, add on both sides

13x=130

divide into both sides

x=10

to solve for angle R

substitute 10 for x

6(10)-9

R=51