Let $a_1, a_2, a_3, \ldots$ be in an arithmetic progression of positive terms.
Let $A_k=a_1{ }^2-a_2{ }^2+a_3{ }^2-a_4{ }^2+\cdots+a_{2 k-1}{ }^2-a_{2 k}{ }^2$.
If $A_3=-153, A_5=-435$ and $a_1{ }^2+a_2{ }^2+a_3{ }^2=66$,
then $a_{17}-A_7$ is equal to
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