How can I solve this infinite exponent tower?

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Using calculus (or algebra), how would I solve an infinite exponent tower such as this?

$$c_0x^{c_1x^{c_2x^{c_3x^{.^{.^.}}}}}=a$$

Where $c_0=1$ and $c_{n+1}=\frac{c_n}{2}$ for $n=0,1,\ldots$ and $a>0$.