Day 7

$\begin{array} {ccccc} \huge & & & & \huge \color{purple}{X}& \huge \color{purple}{X}\\ \huge & & & & \huge \color{red}{Y}& \huge \color{red}{Y}\\ \huge + & & & & \huge \color{blue}{Z}& \huge \color{blue}{Z}\\ \hline \huge& & & \huge \color{purple}{X} & \huge \color{red}{Y} & \huge \color{blue}{Z} \end{array}$

**If each letter represents a different nonzero digit, what must $\large \color{blue}{Z}$ be?**

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