$$(5+\sqrt{5})^{-19}{31x}(-\sqrt{5}+\sqrt{5})$$
$0$
$$31\left(5+\sqrt{5}\right)^{-19}x\left(-\sqrt{5}\right)+31\left(5+\sqrt{5}\right)^{-19}x\sqrt{5}$$
$$-31\left(5+\sqrt{5}\right)^{-19}x\sqrt{5}+31\left(5+\sqrt{5}\right)^{-19}x\sqrt{5}$$
$$0$$
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