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10x[25: (35x25=34x25)+x]-50=0

Răspuns :

10x[25:(35x25-34x25)+x]-50=0
10x[25:(875-850)+x]=50
10x[25:25+x]=50
10*[5+x]=50
5+x=50:10
x=5-5
x=0
proba 10*[5+0]=50      10*5=50    50=50