$$J-2\sqrt{3}=\frac{\sqrt{3}+1}{\sqrt{3}-1}$$
$J=3\sqrt{3}+2\approx 7.196152423$
$$J-2\sqrt{3}=\frac{\left(\sqrt{3}+1\right)\left(\sqrt{3}+1\right)}{\left(\sqrt{3}-1\right)\left(\sqrt{3}+1\right)}$$
$$J-2\sqrt{3}=\frac{\left(\sqrt{3}+1\right)\left(\sqrt{3}+1\right)}{\left(\sqrt{3}\right)^{2}-1^{2}}$$
$$J-2\sqrt{3}=\frac{\left(\sqrt{3}+1\right)\left(\sqrt{3}+1\right)}{3-1}$$
$$J-2\sqrt{3}=\frac{\left(\sqrt{3}+1\right)\left(\sqrt{3}+1\right)}{2}$$
$$J-2\sqrt{3}=\frac{\left(\sqrt{3}+1\right)^{2}}{2}$$
$$J-2\sqrt{3}=\frac{\left(\sqrt{3}\right)^{2}+2\sqrt{3}+1}{2}$$
$$J-2\sqrt{3}=\frac{3+2\sqrt{3}+1}{2}$$
$$J-2\sqrt{3}=\frac{4+2\sqrt{3}}{2}$$
$$J-2\sqrt{3}=2+\sqrt{3}$$
$$J=2+\sqrt{3}+2\sqrt{3}$$
$$J=2+3\sqrt{3}$$
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