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a+3-Edek
a+3+3-Ewa
a+3+a+3+3=29
2a+9=29/-9
2a=20/:2
a=10
Ala ma 10 lat
ala-x-3
ewa-x+3
x+x+3=29
2x=29-3/:2
x=13
13-3=10
odp. ala ma 10 lat