84 - sd + 65d
5xy + 3zx
(6z/7) + (x^2/5) - x^2y^2 + y^2
x^2 + 4x - 4
5xz*y
2wy
(8x/2) - 0.5y
0.04bl - b^2l
3wy
x + d - xd + dy - dyx
(8x/5) - (5x^2) + 8sx
14x + x^2 - xy + y^2
