Răspuns :
[80 x (a : 16 - 64) x 60 – 3 980] : 4 = 3 805
80 x (a : 16 - 64) x 60 – 3 980= 3 805x4=15220
80 x (a : 16 - 64) x 60 – 3 980= 3805x4=15220+3980=19200
80 x (a : 16 - 64) x 60 =19200:60=320
a : 16 - 64 =320:80=4
a:16=4+64=68
a:16=68
a=68x16
a=1088