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a-wiek agnieszki
k+5=a
(a-5)=2(k-5)
(k+5-5)=2k-10
k=2k-10
10=k
a=15
15+x+10+x=43
25+2x=43
2x=43-25
2x=18
x=9
Odp.Kinga ma 10lat a Agnieszka ma 15, za 9 lat suma wieku dziewczynek wyniesie 43.