Just 2

Algebra Level 1

\[ \begin{array} { c c c c c c c c c c } a & + & b & & & & & = & 3 \\ & & b & + & c & & & = & 7 \\ & & & & c & + & d & = & 9 \\ a & & & + & & & d & = & ? \\ \end{array} \]

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