Respuesta :

(2/3)t - (1/6)t = t-(13/2)

(2/3)t - (1/6)t - t = -(13/2)

t ((2/3) - (1/6) - 1 ) =  -(13/2)
t = 
-(13/2) / ((2/3) - (1/6) - 1 )
  = 13