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12536+b-3000=10.500+490

Răspuns :

b = 10500 + 490 -12536 + 3000
b = 1454

proba :

12536+ 1454-3000=10.500+490
12536+b-3000=10500+490=10990
12536+3000=42536
b=42536-10990
b=64613
sper ca te.am ajutat