Carte=2pixuri
Caiet=pix-1000
5pixuri+3carti+12caiete=45500
5pixuri+3*2pixuri+12caiete=45500
5pixuri+6pixuri+12caiete=45500
11pixuri+12caiete=45500
11pixuri+12*(pix-1000)=45500
11pixuri+12pixuri-12000=45500
23pixuri-12000=45500
23pixuri=45500+12000
23pixuri=57500
1pix=57500:23
1pix=2500
Carte=2pixuri
Carte=2*2500
Carte=5000
Caiet=pix-1000
Caiet=2500-1000
Caiet=1500