Respuestas

2013-09-23T16:10:05+02:00
6y - ( 2y + 1 )= - {- 5y + [- ( - 2x - 1) ] }
6y - 2y - 1= - (- 5y + ( 2x + 1) )
6y - 2y - 1 = 5y - 2x - 1

-y + 2x