Question

Que se obtiene al simplificar 12x-{3y+[-4-(7x-2y) +(9x-y)]} ?

Answer 1

Respuesta:

12x-[3y+[-4-(7x-2y)+(9x-y)]]

12x-[3y+[-4-7x+2y+9x-y]]

12x-[3y-4-7x+2y+9x-y]

12x-[2x+4y-4]

12x-2x-4y+4

10x-4y+4 = 2 ( 5x - 2y + 2)

Espero te sirva :)