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Afla termenul necunoscut:
6/2+[(x/2-5/2)+2/2]=21/2


Răspuns :

6/2+[(x/2-5/2)+2/2]=21/2
6/2+[x/2-3/2]=21/2
x/2=21/2-6/2+3/2
x/2=18/2
x/2=9
x=9*2
x=18