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Completion requirements
Solve the given system of equations by substitution. Verify the solution.
\(\left\{ \begin{array}{l}
x + y = 29 \\
x - y = 175 \end{array} \right.\)
\(\left\{ \begin{array}{l}
x + y = 29 \\
x - y = 175 \end{array} \right.\)