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Afla numarul necunoscut
15+b+36=36+18+15
25+c-25=18+36
b+28-28=51-37


Răspuns :

15+36+b=36+15+18
36-36=0
15-15=0
18-b=?b=18
25+c-25=18+36
c=54
b+28-28=51-37
b= 14