Digit Sum, What's Z?

Logic Level 2

XXXXYYYY+ZZZZYXXXZ \large{\begin{array}{ccccccc} && & & \color{#3D99F6}X& \color{#3D99F6}X & \color{#3D99F6}X&\color{#3D99F6}X\\ && & & \color{#20A900}Y& \color{#20A900}Y & \color{#20A900}Y&\color{#20A900}Y\\ +&& & & \color{#D61F06}Z& \color{#D61F06}Z & \color{#D61F06}Z&\color{#D61F06}Z\\ \hline & & & \color{#20A900}Y& \color{#3D99F6}X& \color{#3D99F6}X & \color{#3D99F6}X&\color{#D61F06}Z\\ \hline \end{array}}

If X\color{#3D99F6}X, Y \color{#20A900}Y and Z\color{#D61F06}Z are distinct digits in the sum above, then find Z\color{#D61F06}Z.

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