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x - (3x - 53) = 13
x - 3x +53 = 13
53 - 13 = 3x - x
40 = 2x
x = 20
la edad de jonas es 20
x - (3x - 53) = 13
x - 3x + 53 = 13
40 = 2x
20 = x
Rpta: Su edad actual es 20 años.