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Ajutor!!! a+a+a+2000-3999-101=900

Răspuns :

3a+2000-3999=900+101=1001/+3999
3a+2000=5000/-2000
3a=3000/:3
a=1000
3a+2000-3999-101=900/+101
3a+2000-3999=1001/+3999
3a+2000=5000/-2000
3a=3000/:3
a=1000