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y=wiek syna teraz
x-5=(y-5)*4
x=3y
x-5=4y-20
x=3y
x=4y-15
3y=4y-15
y=15
x=3y
x=3*15
x=45
y=15
x=45
2*(15+15)=45+15
60=60
Odp za 15lat ojciec będzie 2 razy starszy od syna.