Solve for t
t=\frac{R-209}{8}
Solve for R
R=8t+209
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8t+209=R
Swap sides so that all variable terms are on the left hand side.
8t=R-209
Subtract 209 from both sides.
\frac{8t}{8}=\frac{R-209}{8}
Divide both sides by 8.
t=\frac{R-209}{8}
Dividing by 8 undoes the multiplication by 8.
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