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m-wiek Maćka
d=4m
d+2=3(m+2)
4m +2=3m+6 /-3m -2
m=4
Maciek ma 4 lata, Dorota 16.
d+x=2(m+x)
16+x=8+2x / -x -8
x=8
Za 8 lat Dorota będzie dwa razy starsza od Maćka.