Answer:
t=10
Step-by-step explanation:
(t+10)+t=t+20,
Combine like terms
2t+10 = t+20
Subtract t from each side
2t-t+10 =t-t+20
t+10 =20
Subtract 10 from each side
t+10-10 = 20-10
t = 10
-t -t
__________
t + 10 = 20
-10 -10
_________
