Solve for s_10
s_{10}=-\frac{s^{2}}{3}
Solve for s
s=\sqrt{-3s_{10}}
s=-\sqrt{-3s_{10}}\text{, }s_{10}\leq 0
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3s_{10}=-s^{2}
Subtract s^{2} from both sides. Anything subtracted from zero gives its negation.
\frac{3s_{10}}{3}=-\frac{s^{2}}{3}
Divide both sides by 3.
s_{10}=-\frac{s^{2}}{3}
Dividing by 3 undoes the multiplication by 3.
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