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y -wiek ojca
7(x-10) = y-10
2(x+15) = y+15
7x-70+10=y
2x+30- 15=y
7x-60=y
2x+15=y
7x-60=2x+15
5x= 75
x= 15
y= 2x+15 =2·15+15= 45
Odp. Ojciec ma 45 lat.