Addition
(x2y+2xy+x)+(xy+y)
x2y+3xy+x+y
(x+y-3)-(3x+6)
-2x+y-9
(x+2)(y)
xy+2y
(x+2y)+(3x-y)
4x+y
(4x2+6y2-x2y2)+(-2x2+3x2y)
2x2+6y2-x2y2+3x2y
(x2y2-2x+7)-(x2+5x-3)
x2y2-x2-7x+3
(x+3)(y-2)
xy-2x+3y-6
(x+y)(2)-(3x-4y)
-x+6y
(x2y-3xy2+5y)+(2x2y+4xy2-6y)
3x2y+xy2-y
(x2y2-3xy+11)-(2x2y2+4xy-2)
-x2y2-7xy+13
(2x-y)(x+4y)
2x2+7xy-4y2
(x-y)(x+y)+2x2
3x2-y2
(3x2y+5xy-2y)+(-4x2y-3xy+y)
-x2y+2xy-y
(2x2y2+x2y-xy2+7x-3y)-(5x2y2+4x2y-y+5)
3x2y2-3x2y-xy2+7x-2y-5
(x+2y)(x2-xy+y2)
x3+x2y-xy2+2y3
(x+2y)(x-3y)-(x2-y2)
-xy-5y2