Question

-2x - 2y - {- 5x - [( - 2x - 4y) - (7y - 3x)] + 4x}
eliminar signos de agrupacion

Answer 1

-2x -2y +5x -[-2x-4y-7y+3x] + 4x
3x -2y +2x +4y +7y -3x +4x
6x + 9y