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###
\begin{align*}
F_{up} = P_{injector}*A_{injector} \\
F_{up} + N*F_{bolt}=0 \\
|F_{bolt}| = 1 \\

\end{align*}
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\begin{equation} \label{eq1}
\begin{split}
A & = \frac{\pi r^2}{2} \\
 & = \frac{1}{2} \pi r^2
\end{split}
\end{equation}