4x-2y=0
(x+3)(x-2)=0
3xy+6xz-yz=3x+6y-z
3(2x+30)=x-5
2x^2-x+6=0
5x(4+y)=2x+9
x=2y
4(x+y)-3x(2^5)+7z=10
2xy=33
x+y=33
