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x+6 - wiek Stasia za 6 lat
x-4 - wiek Stasia 4 lata temu
3(x-4) - wiek Stasia za 6 lat
3(x-4)=x+6
3x-12=x+6
3x-x=6+12
2x=18 /:2
x=9
Odp.: Staś ma 9 lat