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afla numarul necunoscut;
a+[980+796]=4000
[2901+6156]-b=5435
c-[10000-8903]=3679
[9980-7675]-d=980


Răspuns :

a+1776=4000
a=4000-1776
a=2224

9057-b=5435
b=9057-5435
b=3622

c-1097=3679
c=3679+1097
c=4776

2305-d=980
d=2305-980
d=1325
Sper ca te-am ajutat