If the following planes all intersect at the same line, what is the value of \( a+ b:\)
\[ \begin{align}
P_1 &: 3x + ay + 2z -2 =0 \\
P_2 &: 2x + by - 2z + a = 0 \\
P_3 &: 3x - y + 2z + b = 0? \end{align}\]

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