Solve for c
\left\{\begin{matrix}c=\frac{S}{now}\text{, }&w\neq 0\text{ and }n\neq 0\text{ and }o\neq 0\\c\in \mathrm{R}\text{, }&\left(w=0\text{ or }n=0\text{ or }o=0\right)\text{ and }S=0\end{matrix}\right.
Solve for S
S=cnow
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S=conw
Anything plus zero gives itself.
conw=S
Swap sides so that all variable terms are on the left hand side.
nowc=S
The equation is in standard form.
\frac{nowc}{now}=\frac{S}{now}
Divide both sides by onw.
c=\frac{S}{now}
Dividing by onw undoes the multiplication by onw.
S=conw
Anything plus zero gives itself.
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