a * x ^ 2 * y + bxy ^ 2 +cxyz
z=mx/y find for x
g=ac/b find for a
3 5/8 - 1 2/3
x-y-4=0
x+3y+1=0
u=x+y/kx find for x
g=ca+ba find for a
g=cxy find for x
u=ka-b find for a
