Update chapters/dae.tex

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

chapters/dae.tex

@@ -86,7 +86,7 @@ \chapter{Modelica DAE Representation}\label{modelica-dae-representation}
 \item
   Non-\lstinline!Integer! equations at most requiring flipping sides of the equation to obtain the used assignment form.
 \item
-  For \lstinline!Integer! uniquely as a term (without any multiplicative factor) on either side of the equation, at most requiring addition or subtraction of a previously computed value to obtain the used assignment form.
+  For \lstinline!Integer! equations the solved variable must appear uniquely as a term (without any multiplicative factor) on either side of the equation, at most requiring addition or subtraction of other terms in the equation to obtain the used assignment form.
 \end{itemize}
 The interpretation of the non-solved form of \eqref{eq:dae-discrete-real} at events, on the other hand, is that at events, the discrete-time \lstinline!Real! variables $z$ are solved together with the continuous-time variables using \eqref{eq:dae} and \eqref{eq:dae-discrete-real}.