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B = x+14
x + x+14 = 56
2x+ 14 =56
2x 56-14
2x = 42
x = 21 = A
B = x+14
B = 21+14
B = 35
Edad deB = x
Edad de A = x - 14
x + x - 14 = 56
2x - 14 = 56
2x = 56 + 14
2x = 70
x = 70/2
x = 35
Edad de B = x = 35 años
Edad de A = x - 14 = 35 - 14 = 21años
Respuesta.
B tiene 35 años y A 21 años.