Hi, On Mon, Aug 14, 2023 at 5:13 PM Xavier B. wrote:

I have this text and the end of the paragraph:

Definitivament és el mètode més senzill. L'atribució més antiga que conec d'aquest mètode és de James Tanton \cite{canvi-variable-equacio-segon-grau, james-tanton-web}. \placeformula[eq:james-tanton-canvi-de-variables] \startformula \startalign \NC ax^2 + bx + c = 0 \NC \NR \NC ax^2 + bx = -c \NC \quad \text{transposem } c\NR \NC x^2 + \frac{b}{a} x = - \frac{c}{a} \NC \quad \text{dividim per }a\NR \NC x \left( x + \frac{b}{a} \right) = - \frac{c}{a} \NC \quad \text{factoritzam} \NR \NC (k-D)(k+D) = - \frac{c}{a} \NC \quad \text{canvi de variable} \NR \NC k^2 - D^2 = - \frac{c}{a} \NC \quad \text{suma per diferència} \NR \NC k = \pm\sqrt{ D^2 - \frac{c}{a}} \NC \quad \text{resolem l'equació} \NR \NC x = k - D = \NC \pm \sqrt{ D^2 - \frac{c}{a}} - D\quad \text{desfeim el canvi} \NR \stopalign \stopformula on $D = (\frac{b}{2a})$ i $x = k-D$.

and then the formula goes to next page. Is there any way to split align environment? In wiki I could not find nothing.

No, align does not split over pages. But ordinary formulas do. You can play with \alignhere and \breakhere, and add text with \texthere[right]{some text} or \texthere[left]{some other text}. /Mikael (I think I would write sentences and a few formulas instead of stacking them all like this)