1/2 (X6 2-y)+1/3 (X-Y 2)+(X is a square symbol)

10a+6 B- 7a+3 B- 10a+ 10b+ 12a+8b

4xy-2y+3x-xy

(3x-5y)-(6x+7y)+(9x-2y)

2a-[3b-5a-(3a-5b)]

(6m2n-5mn2)-6(m2n-mn2)

(5x-4y-3xy)-(8x-y+2xy)

a-(a-3b+4c)+3(-c+2b)

7x2-7xy+ 1

6-5b-(3a-2b)-( 1-6b)

(5x-4y-3xy)-(8x-y+2xy)

(3x2-4xy+2y2)+(x2+2xy-5y2)

(x-y)2-(x-y)2-[(x-y)2-(x-y)2]

(2k- 1)x2-(2k+ 1)x+3

2(x-2)-3x-2

2y-3y+ 1-6y

3b-6c+4c-3a+4b

2a-5b+4c-7a+5a+5b-4c

4a+6c+7a-6a+7b-3c-6b

5b+2c-7b+4z-3z

3b+3c-6a+8b-7c-2a

3c-7b+5z-7b+4a-6n+8b-3v+9n-7v

hope this helps