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7-23.

Solve the system of equations shown below. Homework Help ✎ x + y + z = 40
y = x − 5
x = 2z

Use substitution to solve.

If x = 2z, then y = 2z − 5.

Now that you have expressions for both x and y in terms of z, substitute them into the first equation and solve for z.
Then solve for x and y.