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.
Thanks in advance,
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