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Números consecutivos:
•x-1
•x
•x+1
(x-1)*+ x* = (x+1)* +12
x* - 2x + 1 + x* = x* + 2x + 1 + 12
x* - 4x - 12=0
x. -6
X. +2
He utilizado aspa simple ↑
(X-6)(x+2) =0
x-6=0
x=6
Ya tienes el valor de x, ahora solo reemplaza:
x-1=5
x=6
x+1=7