Ile to potrzebuje działania !!
(12x + 2y-5) + (6y-12x + 9)

- (3x + 9) - (12 + 8x)

12 - (- 6x + 12) + 36x

14+ (3x-9) - (5x + 11)

- (- 7x + 15) - (- 8 + 4x)

16 + 2x + (8x-26)

14x + 36- (9 + 36)

- (8z + 11) + 8z

3x- (12-9x)

- (7x + 9)

-9-18+ (21x-9)

(64x + 5) + (8x-9)

- (36x-1) + (36x-1)

- (5x + 5) + 12x

(8x-9) + ( 9x-8)