Answer:
She made a mistake in Step 7.
Step-by-step explanation:
Step 1 through 6 are correct. Only from Step 6 to Step 7 the problem comes in: both sides of the equation are multiplied by x, however the x on the left side, by error, becomes 1. The correct state in Step 7 should look like this:

Answer:
13 it is very easy
Step-by-step explanation:
Answer:
?
Step-by-step explanation:
X equals $1.47
Burger is $4.46
Fries are $1.47
So the drink is $1.57