Simplify \(\frac{2}{6}\) to \(\frac{1}{3}\).
\[-\frac{1}{3}=3\times \frac{c}{9}\]
Simplify \(3\times \frac{c}{9}\) to \(\frac{c}{3}\).
\[-\frac{1}{3}=\frac{c}{3}\]
Multiply both sides by \(3\).
\[-\frac{1}{3}\times 3=c\]
Cancel \(3\).
\[-1=c\]
Switch sides.
\[c=-1\]
c=-1
