$$v : 14 x + 10 y - 12 x y - 13 , 18 - 7 x - 10 y + 8 x y , 4 x y$$
$\frac{2xy\left(7vx^{2}-2800xy^{2}+10vxy+5460xy-18vx-1274x+1400y^{2}-8vyx^{2}-1176yx^{2}-4340y+1344\left(xy\right)^{2}+3276\right)}{7}$
$\frac{vx}{14}-12xy+10y-13,8xy-7x-10y+18,4xy$
