Solve for C
C=Se^{1-k}
Solve for S
S=Ce^{k-1}
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Ce^{k-1}=S
Swap sides so that all variable terms are on the left hand side.
e^{k-1}C=S
The equation is in standard form.
\frac{e^{k-1}C}{e^{k-1}}=\frac{S}{e^{k-1}}
Divide both sides by e^{k-1}.
C=\frac{S}{e^{k-1}}
Dividing by e^{k-1} undoes the multiplication by e^{k-1}.
C=Se^{1-k}
Divide S by e^{k-1}.
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