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a+13-29=31 care e raspunsul. ?​

Răspuns :

a+13-29=31

a+13=31+29

a+13=60

a=60-13

a=47

a+13-29=31

a+13=31+29

a+13=60

a=60-13

a=47

v:47+13-29=60-29=31