1
(5x2+2xy-—x)-(3x2-2xy+ x)
8
4 1
(—xy-5y2-1)-(x2+—xy-6y2+2)
5 6
9 7
(xy+—y-—)-(xy-x+3)
8 8
( y- x- z2)+(3y-2x+3z2)
(5k2+5k)+( k2+4k+7)
(5a2+9a-3b)+(2a2+3a- b)
7x2-(6x2-8x+7)-(8x+8)
7y2-( x2+y)+(8x2+5y2)
1
(6x2+8xy-—x)-(8x2- xy+ x)
7
1 1
(—xy-8y2+1)+(x2+—xy-8y2-6)
8 3
7 6
(xy-—y-—)+(xy+x+3)
8 7
(8y+2x+7z2)-(3y+7x+4z2)
(8k2+5k)-(5k2+2k+3)
(6a2-9a+9b)+(5a2-2a+9b)
3x2-(9x2-8x+5)+(3x+4)
3y2+(9x2+y)-(6x2-9y2)
7
(2x2+3xy-—x)-(8x2+9xy+7x)
6
9 1
(—xy+9y2+1)+(x2-—xy-9y2-6)
8 8
5 1
(xy+—y-—)+(xy-x+7)
4 3
(8y-3x+6z2)+( y-3x-2z2)
(7k2+5k)-(4k2+4k-8)
(4a2+ a-7b)+(8a2+4a-3b)
7x2-(7x2-6x-1)+(7x+1)
5y2-(4x2-y)+(9x2-2y2)
2
(5x2+8xy-—x)-(6x2+8xy+4x)
3
1 2
(—xy-5y2-3)-(x2-—xy+6y2-3)
5 3
1 4
(xy-—y+—)+(xy-x+3)
7 3
(8y+5x+ z2)-(6y-6x-4z2)
(6k2-8k)+(3k2-6k+9)
( a2+9a-4b)-(8a2+7a- b)
4x2-(3x2-4x+8)-(9x-6)
4y2-( x2-y)-(2x2+5y2)
1
(5x2+ xy+—x)+(3x2+4xy-3x)
5
1 4
(—xy-2y2-1)+(x2-—xy-8y2-9)
8 3
1 1
(xy+—y-—)+(xy+x+9)
4 5
(6y-2x-8z2)-(2y+7x-9z2)
(5k2-2k)-(6k2+7k-3)
(7a2-4a- b)-(5a2-2a+2b)
3x2-(3x2+9x-6)-(2x-4)
3y2-( x2+y)-(2x2+7y2)
5
(3x2-9xy-—x)-(4x2+ xy-2x)
4
6 7
(—xy-8y2+5)-(x2-—xy+4y2-7)
7 8
1 2
(xy-—y+—)-(xy+x+5)
5 3
(7y-4x-4z2)+(4y+4x- z2)
(4k2-9k)+(4k2-4k-7)
(6a2+6a-4b)+(5a2-5a-4b)
7x2-(6x2-5x-7)-(7x+8)
3y2+(4x2+y)-(5x2-9y2)
4
( x2+9xy-—x)-(9x2+4xy-4x)
5
2 1
(—xy+5y2-6)+(x2-—xy- y2-9)
3 3
6 1
(xy+—y-—)-(xy-x-8)
5 6
(5y-5x-6z2)+(5y+4x-7z2)
(5k2+8k)-( k2-5k+9)
(4a2-6a-6b)+(3a2-7a+8b)
8x2+(8x2+6x+1)-( x+8)
y2+(8x2+y)-( x2-9y2)
1
(6x2+2xy+—x)-( x2+5xy-9x)
5
1 5
(—xy-2y2+3)+(x2-—xy-9y2+2)
7 4
1 6
(xy+—y+—)-(xy+x-3)
6 5
(4y+ x+5z2)+(6y-9x+7z2)
(3k2+ k)+(8k2-8k-3)
(8a2-5a-3b)+(4a2+8a+6b)
5x2+(8x2-9x+1)+(9x+1)
2y2-(5x2-y)-(6x2-5y2)
5
(6x2-9xy-—x)-(9x2+8xy-8x)
4
8 1
(—xy-9y2-2)+(x2+—xy+4y2+7)
7 4
1 5
(xy+—y-—)-(xy+x+1)
5 4
(5y+ x+7z2)-( y+5x+7z2)
(5k2-7k)+(6k2-9k-6)
( a2+4a-4b)+(2a2-7a+8b)
7x2+(3x2-7x-8)-(2x+1)
8y2+(4x2+y)+(7x2+6y2)
1
(9x2-5xy-—x)-(4x2-8xy+8x)
5
5 1
(—xy-7y2+2)+(x2+—xy- y2-3)
6 3
3 3
(xy-—y+—)+(xy+x+3)
4 4
(4y-2x- z2)+(7y+7x-9z2)
(4k2-9k)+( k2-8k-1)
(5a2-5a-8b)-(6a2+2a+5b)
3x2+(8x2+4x-1)-(5x+8)
7y2-(8x2+y)+(3x2+5y2)
5
(2x2-5xy-—x)+( x2+2xy+2x)
4
3 1
(—xy-4y2+4)+(x2+—xy+ y2-2)
4 3
1 3
(xy-—y-—)+(xy-x-5)
5 4
(7y+9x- z2)-(5y-5x-2z2)
(3k2-2k)-(8k2-7k-6)
(7a2-3a+6b)-(3a2-2a+2b)
8x2-( x2+9x+9)+(9x-6)
8y2-(3x2+y)-(6x2-3y2)
8
(8x2-3xy-—x)+(2x2-3xy+2x)
7
1 2
(—xy-3y2+3)-(x2+—xy+9y2+5)
5 3
1 8
(xy+—y-—)+(xy+x+4)
3 7
( y+ x-4z2)-(5y+2x-2z2)
(8k2+5k)-(4k2-3k-1)
(8a2-8a-4b)-( a2+6a-4b)
5x2-(6x2-7x-1)-(6x+9)
7y2+(5x2-y)-(2x2+6y2)
1
(3x2+6xy-—x)-(4x2+5xy+4x)
7
4 6
(—xy-3y2-1)-(x2-—xy+7y2-8)
5 7
1 8
(xy-—y+—)+(xy-x-6)
5 7
(5y-8x+9z2)-( y-6x+3z2)
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