Solve for r
r=\frac{u_{n}}{3}
Solve for u_n
u_{n}=3r
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3r=u_{n}
Swap sides so that all variable terms are on the left hand side.
\frac{3r}{3}=\frac{u_{n}}{3}
Divide both sides by 3.
r=\frac{u_{n}}{3}
Dividing by 3 undoes the multiplication by 3.
Examples
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Limits
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