Check your formula thoroughly.
There is a wrong unit calculation.
Lets give 10mm^2 to x.
This equation won't have a result.

Equation can be calculated with this correction.
Given with units of x is mm^2 of course.

For its to be solved, f(x)=y.
And y should be zero.
And if we plot the f(x) function,
You can see y never gets to zero.

So basically, this equation is not solvable.
With given equation and numbers I say.
Regards