>.<br>
</li>
<li>The left-hand side must contain a variable that the equation defines, written in its untransformed form. For example, <code>C_s</code> for consumption. Constructs like <code>C_s*2</code> or <code>log(C_s)</code> are not allowed on the left-hand side. If an operator or function appears on the left, the entire expression will be treated as the variable name.</li>
<li>An equals sign <code>=</code> must separate the left-hand side from the right-hand side.</li>
<li>The right-hand side should co