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s - wiek syna
o-12 -8 = s-8
o+12 = 2(s+12)
o=s+12
s+24=2s+24
s=0
musi być błąd w treści
y -wiek ojca
I. y-8=12(x-8)
II. y+12=2(x+12)
z I. y=12x-96+8=12x-88
do II. 12x-88+12=2x+24
12x-2x=24-12+88
10x=100
x=10
y=12x-88=12*10-88=120-88=32
Odp.Ojciec ma 32 lata, a syn 10lat.