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x-wiek syna
y- wiek ojca
x+y=52
y-6=3(x-6)
y=52-x
52-x-6=3x-18
y=52-x
-x-3x=-18-46
y=52-x
-4x=-64 /*(-1)
y=52-x
4x=64
y=52-x
x=16
y=52-16
x=16
y=36
x=16
Ojciec ma obecnie 36 lat a syn 16.
y- wiek ojca
x+y=52
y-6=3(x-6)
x=52-y
y-6=3x-18
y-6=3(52-y)-18
y-6=156-3y-18
y+3y=156-18+6
4y=144 /:4
y=36
y-6=3(x-6)
36-6=3x-18
30+18=3x
48=3x /:3
16=x
x=16
y=36