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x+15-wiek piotrka
x+15+5=2x
20=x
odp marek ma 20 a piotrek 35
m = wiek marka
p = m + 15
2m = p +5
2m = m + 15 + 5
2m - m = 20
m = 20
p = m + 15
p = 20 + 15 = 35
marek ma 20 lat a piotr ma 35 lat
p=(teraz)25
25+5=30
p=30/2=15
odp. piotr ma teraz 25 lat , za 5 lat 30 wtedy marek bedzie miał 15