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x - 6 = 1/4x
Y lo despejas:
x = 1/4x + 6
x -1/4x = 6
3/4x = 6
x = 6 : 3/4
x = 8
Tenés 8 años.
4x - 24 = x
3x = 24
x = 8
Tienes 8 años