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