Answer:
r = 26
Step-by-step explanation:
[tex]30r+(-20)=760\\30r-20=760\\30r=780\\r=26[/tex]
30r + –20 = 760
Add 20 to each side
30r + –20+20= 760 +20
30r = 780
Divide each side by 30
30r/30 = 780/30
r = 78/3
r= 26
