a=ap.cu 2 camere
b=ap.cu 3 camere
c=ap.cu 4 camere
b:c=1 si rest 13
b=c+13
a+b+c=205
2a+3b+4c=627
a+c+13+c=205
2a+3(c+13)+4c=627
a+2c=192
2a+7c=588
a=192-2c
2(192-2c)+7c=588
384-4c+7c=588
3c=204
c=68 ap.cu 4 camere
b=c+13=68+13=81 ap.cu 3 camere
a=205-81-68=56 ap. cu 2 camera