Solve for s
s=y\times 1.25^{x}
Solve for x
\left\{\begin{matrix}x=\log_{0.8}\left(\frac{y}{s}\right)\text{, }&\left(y<0\text{ and }s<0\right)\text{ or }\left(y>0\text{ and }s>0\right)\\x\in \mathrm{R}\text{, }&y=0\text{ and }s=0\end{matrix}\right.
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0.8^{x}s=y
Swap sides so that all variable terms are on the left hand side.
\frac{0.8^{x}s}{0.8^{x}}=\frac{y}{0.8^{x}}
Divide both sides by 0.8^{x}.
s=\frac{y}{0.8^{x}}
Dividing by 0.8^{x} undoes the multiplication by 0.8^{x}.
s=y\times 1.25^{x}
Divide y by 0.8^{x}.
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