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x +6 = (x -6)²
x +6 = x² -12x +36
0 = x² -12x +36 -x -6
0 = x² -13x +30
x² -13x +30 = 0
(x -10) (x -3) = 0
x -10 = 0 x-3 = 0
x = 10 x = 3 → Descartamos porque hace 6 años, no pudo
tener -3 años
La edad actual es 10 años