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a+357-428=209
a-457+376=287



Răspuns :

a -71= 209
a=209+71
a=280

a-81=287
a=287+81
a=368
a+357-428=209
a+357=209+428
a+357=637
a=280
 

a-457+376=287
a-833=287
a=287+833
a=1120