Substitution.
Here is an example.
Let x be equal to 3 and y equal to 3.

From this we can conclude that the values of both x and y are equal to three therefore x and y have the same value and are equal.

Here in your case we have:

Hope this helps.
r3t40
Need more information to answer
4 9/20 that is the mixed number of 4.45
Answer:
x=100
Step-by-step explanation:
x+123=223
x=223-123
x=100
Bracelet
There are 2 bracelets and she possibly picks three. :)