Question 1096598
<br>{{{x+y+z=-x^2-y^2+z}}}
{{{x+y = -x^2-y^2}}}<br>
Variable z has been eliminated from the equation.  For any values we find for x and y that satisfy the equation that is left, there is no restriction on the value of z.<br>
So z = any number<br>
Not a very interesting problem.  Are you sure you posted it correctly?