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Radu se gandeste la un numar ,il aduna cu el insusi ,apoi cu50si obtine 100

Răspuns :

n+n+50=100
n+n=100-50
2n=50
n=50:2
n=25
a+a+50=100
2a+50=100
2a=100-50
2a=50
a=50:2
a=25