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* significa al cuadrado
(x+x+1)* = (x+2)* + 12
(2x+1)* = (x+2)* +12
(2x)* + 1* + 2(2x)(1) = x* + 2* + 2(x)(2) + 12
4(x)* + 1 + 4x = x* + 4 + 4x + 12
3(x)* = 15
x* = 5
x = raiz de 5 = 2,236 = 2
nùmeros consecutivos= x= 2, x+1= 3, x+2= 4