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El numero = x
El siguiente = x + 1
El triple del numero = 3x
El doble del siguiente = 2( x + 1)
3x + 2(x + 1) = 84/2
3x + 2x + 2 = 42
5x + 2 = 42
5x = 42 - 2
x = 40/5
x = 8
Respuesta.
El numero es el 8