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\begin{equation} \begin{split} x =& \left( here is some equation \right. \\ & \left. here is the rest \right) \end{split} \end{equation}
You use periods after braces to indicate a "false" starting or ending. You would do something like this: Code: \begin{equation} \begin{split} x =& \left( here is some equation \right. \\ & \left. here is the rest \right) \end{split} \end{equation}