Suma y resta de polinomios (D)

(2a-6) - (6a-7)

(2a+y) + (9a-y)

(9b-5) + (6b-9)

(9y-3) + (5y+5)

(7x-4) - (8x-4)

(7x-7) - (9x+8)

(6a) - (3b)

(3y+4) + (5y-5)

(8x-6) - (2x-3)

(3y+7) + (4y-5)

7y+2

6x-3

14y+2

-2x-15

x+8

-4a+1

15b-14

6a-3b

8y-1

11a