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x+10 wiek za 10 lat
x-4 wiek 4 lata temu
x+10=2(x-4)
x+10=2x-8
3x=18/3
x=6
x-4- wiek Marka 4 lata temu
x+10- wiek Marka za 10 lat
x+10=2(x-4)
x+10=2x-8
x-2x=-8-10
-x=-18/*(-1)
x=18
Odp. Marek ma 18 lat.