5x+4y-5z
6xy^3
5w^7+5w^5-3w^6-3w-45
x^2+bx+c
x^2-3x+2
yx^3b^4
2x^3 +3x2-1
7xw
x^4+3x^3+5x^2+x-12
6x^9+6x^3+4x^2+6y+6y^3
3ab^2
5xy+3wyx+5x^6-3y^6
