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El consecutivo de x será:- x+1
Luego:
3(x+1)=-12
3x+3=-12
3x=-15
x=-5
Se trata del número -5
Su consecutivo = x + 1
3 (x + 1) = - 12
3x + 3 = - 12
3x = - 12 - 3
3x = - 15
x = - 15/3
x = - 5
Respuesta : El número es = - 5