solveFor return empty array

Hello,

I have an ugly equation:

0=((2*0.87*x-2*sqrt(x^2(0.87^2-1)+4*4^2))/2)^2+((2*0.86*x-2*sqrt(x^2(0.86^2-1)+4*5^2))/2)^2-0.87*((2*0.87*x-2*sqrt(x^2(0.87^2-1)+4*4^2))/2)*((2*0.86*x-2*sqrt(x^2(0.86^2-1)+4*5^2))/2)-6^2

According to WolframAlpha the result ~ 3.9 and 13.0

The nerdamer can parse the input string without an issue (output of toString() function):

0=(-43/25)*sqrt((-651/2500)*x^2+100)*x+(-87/400)*((43/25)*x-2*sqrt((-651/2500)*x^2+100))*((87/50)*x-2*sqrt((-2431/10000)*x^2+64))+(-87/50)*sqrt((-2431/10000)*x^2+64)*x+(993/1000)*x^2+128

$0 = {\left(\frac{2 \cdot \frac{87}{100} \cdot x - 2 \cdot \sqrt{{x}^{2} \left({\frac{87}{100}}^{2} - 1\right) + 4 \cdot {4}^{2}}}{2}\right)}^{2} + {\left(\frac{2 \cdot \frac{43}{50} \cdot x - 2 \cdot \sqrt{{x}^{2} \left({\frac{43}{50}}^{2} - 1\right) + 4 \cdot {5}^{2}}}{2}\right)}^{2} - \frac{87}{100} \cdot \left(\frac{2 \cdot \frac{87}{100} \cdot x - 2 \cdot \sqrt{{x}^{2} \left({\frac{87}{100}}^{2} - 1\right) + 4 \cdot {4}^{2}}}{2}\right) \cdot \left(\frac{2 \cdot \frac{43}{50} \cdot x - 2 \cdot \sqrt{{x}^{2} \left({\frac{43}{50}}^{2} - 1\right) + 4 \cdot {5}^{2}}}{2}\right) - {6}^{2}$

But when I'm trying to solve it then I got an empty array as a result without any error message...

var d = nerdamer(eqString);
console.log(d.toString());
var solutions = d.solveFor('x');
console.log(solutions);
//output: []

I do something wrong?

jiggzson / nerdamer

solveFor return empty array #595