-x+4
2+2x+5y+3z-10x^2
2x
2x^2 +4x+ 6 - x^2 -2
-3a^2b^3c
2x^2 +7x+6-4z
x^2 +bx+c
x+y+c
-10
2x+3
5xyz
x^2 +6x+9
2x+5y-3x+2y+5
2x^2 +7x+6
2x-5y
x^2 -y^2
