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Syn => y
{2y=x
{x-18=3(y-18)
x-18=3(y-18)
2y-18=3y-54
-y=-36
y=36
x=2y
x=72
x-wiek syna
2x - wiek ojca
18 lat temu :
x -18 - wiek syna
2x-18 - wiek ojca
2x-18 = 3(x-18)
2x-18=3x-54|+18
2x = 3x -36| -3x
-x = -36
x = 36 - wiek syna teraz
2 * 36 = 72 - wiek ojca teraz