Respuesta :
Answer
Sam is 13 years old
Step-by-step explanation:
He is 13 years old.
13+7=20
13-3=10
10x2=20
Answer: 13
Step-by-step explanation:
We can represent this in an algebra equation
(x+7)=2(x-3)
(x+7)=2x-6
(x+7)=2x-6
-2x -2x
-x+7=-6
-7 -7
-x= -13
/-1 /-1
x=13
