Solve for n
n=\frac{t_{n}+15}{40}
Solve for t_n
t_{n}=40n-15
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40n-15=t_{n}
Swap sides so that all variable terms are on the left hand side.
40n=t_{n}+15
Add 15 to both sides.
\frac{40n}{40}=\frac{t_{n}+15}{40}
Divide both sides by 40.
n=\frac{t_{n}+15}{40}
Dividing by 40 undoes the multiplication by 40.
n=\frac{t_{n}}{40}+\frac{3}{8}
Divide t_{n}+15 by 40.
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