I FOND YOUR COMPLETE QUESTION IN ANOTHER SOURCE.
PLEASE SEE ATTACHED IMAGE.
The width of the rectangle in this case will be given by:
w = x + 5 + x
Rewriting:
w = 2x + 5
The length of the rectangle will be given by:
L = x + 10 + x
Rewriting:
L = 2x + 10
Answer:
w = 2x + 5
L = 2x + 10