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x + 3 = 3x - 9 x- wiek aktualny grzesia
x - 3x = -9 - 3
-2x= -12 / (:-1)
2x= 12 / : 2
x= 6 odp: grzes ma teraz 6 lat
x-3 - wiek 3 lata temu
3(x-3)-wiek za 3 lata
x-3+3(x-3)=x
x-3+3x-9=x
4x-12=x|+12
4x=x+12|-x
4x-x=12
3x=12 |:3
x=4
Grzes ma 4 lata