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Afla numarul necunoscut: a+989=2007 2100+b=4014 c-1971=3595 10000-d=3480

Răspuns :

a+989=2007
a=2007-989
a=1018
v:1018+989=2007
2100+b=4014
b=4014-2100
b=1914
v:2100+1914=4014
c-1971=3595
c=3595+1971
c=5566
v:5566-1971=3595
10000-d=3480
d=10000-3480
d=6520
v:10000-6520=3480