Answer:
D = 42
A = 42
Step-by-step explanation:
If ABC = DEF
A = D
x + 21 = 2x
21 = 2x - x
21 = x
A = x + 21
(21) + 21 = 42
D = 2x
2(21) = 42
I'm 90% sure. I'm not fully sure though.
