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x +3 = 3x -9
x -3x = -9 - 3
-2x = -12
x = (-12) : (-2)
x = 6
Odp. Grześ ma 6 lat.
wiek Grzesia teraz-->x
wiek Grzesia za 3 lata-->3(x+3)
3(x-3)=x+3
3x-9=x+3 /-x
2x-9=3 /+9
2x=12 /:2
x=6
Grześ ma 6 lat.