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a+200+100-400=400. cum se afla a?

Răspuns :

a+200+100-400 = 400
a+300-400 = 400
a-100 = 400
a = 400+100
a = 500.


Succes!
a+200+100-400=400
a+200+100=400+400
a+200+100=800
a+200=800-100
a+200=700
a=700-200
a=500