Answer:
14
Step-by-step explanation:
Let's call the number x.

Subtract 3 from both sides:

Multiply both sides by 2:

Hope this helps!
N= -7; open the first bracket, then add the two negatives.Then open the second bracket, and cancel opposite sign 3's and then solve.
Answer:
1 sub = $5.50; 1 sandwich = $4.00
Step-by-step explanation:
You can solve this using a matrix and solving using reduced row-echelon form.
I think its EB.
Hope this helps!