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m am gandit la un nr, l am adunat cu 3700,am scazut apoi 2436 si am obtinut 2090. La ce nr m am gandit

Răspuns :

x+3700-2436=2090

x=2090+2436-3700

x=826


a+3700-2436=2090
a+3700=2436+2090
a+3700=4526
a=4526-3700
a=826


Verificare :
826+3700-2436=2090