Servus zusammen,

$${\frac{{\mathtt{60}}{\mathtt{\,\times\,}}{\mathtt{ab}}}{{\mathtt{\,-\,}}\left({\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{a}}\right)}}$$    kürzen durch  12a    =>   - 5b

$${\mathtt{\,-\,}}{\frac{{\mathtt{27}}{\mathtt{\,\times\,}}{\mathtt{a}}}{\left({\mathtt{9}}{\mathtt{\,\times\,}}{\mathtt{a}}\right)}}$$    kürzen durch  9a      =>    -3

Ergebnis  =  -5b - 3

Gruß radix !

merci radix