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El siguiente = m + 1
Resolvemos :
2 (m + 1) = - 12
2m + 2 = - 12
2m = - 12 - 2
2m = - 14
m = - 14/2
m = - 7
Solución : El número es = - 7
(x+1)*2 = -12
2x+2= -12
x= -7
El número es -7