Răspuns:
[980 - 72 - 145 + 6 - (14 + a)] + 119 = 842
[980-72-145+6-(14+a)]=842-119
[980-72-145+6-(14+a)]=723
[908-145+6-(14+a)]=723
[763+6-(14+a)]=723
769-(14+a)=723
14+a=769-723
14+a=46
a=46-14
a=32