The solution to the system of equations is (y, x, z) = (22, 9, 18).
Here's how to solve the system of equations:
From the first equation, we can see that y = x - 3 + 12 = x + 9.
Substituting this expression for y into the third equation, we get:
x + 9 - 7 = z - 11
x + 2 = z
Substituting this expression for z into the second equation, we get:
x + 21 = x + 8 + 13
x + 21 = x + 21
This equation is true for all values of x, which means there are an infinite number of solutions. However, we can still find a specific solution by using any of the equations we've derived so far.
Using the expression for y in terms of x, we get:
y = x + 9
Using the expression for z in terms of x, we get:
z = x + 2
We can now substitute these expressions for y and z into any of the original equations to solve for x. Using the second equation, we get:
x + 13 = x + 8 + 13
x = 9
Now that we know x, we can substitute it into the expressions for y and z to get:
y = x + 9 = 18
z = x + 2 = 11
Therefore, the solution to the system of equations is (y, x, z) = (22, 9, 18).