If you live long enough (and well enough!),
then eventually you are going to have to solve for x. It's unavoidable.
Get used to it. Below are a variety of examples involving both
symbolic and numerical solutions of equations and systems of equations.
Here are the functions and expressions.
Here are the solutions.
> solve(y1=0, x);
> p:=solve(y3=0, x);
> solve(f(x)=0, x);
> solve(g=1, y);
And now, here are the floating point solutions (more or less).
> fsolve(y1=0, x);
> fsolve(y3=0, x);
> fsolve(y3=0, x, complex);
> fsolve(y3=0, x, 0..2);
> fsolve(f(x)=0, x);