Solve for n
n=\frac{b_{n}-15}{15}
Solve for b_n
b_{n}=15\left(n+1\right)
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15+15n=b_{n}
Swap sides so that all variable terms are on the left hand side.
15n=b_{n}-15
Subtract 15 from both sides.
\frac{15n}{15}=\frac{b_{n}-15}{15}
Divide both sides by 15.
n=\frac{b_{n}-15}{15}
Dividing by 15 undoes the multiplication by 15.
n=\frac{b_{n}}{15}-1
Divide b_{n}-15 by 15.
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