Solve for n
n=\frac{C-75}{40}
Solve for C
C=40n+75
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40n+75=C
Swap sides so that all variable terms are on the left hand side.
40n=C-75
Subtract 75 from both sides.
\frac{40n}{40}=\frac{C-75}{40}
Divide both sides by 40.
n=\frac{C-75}{40}
Dividing by 40 undoes the multiplication by 40.
n=\frac{C}{40}-\frac{15}{8}
Divide C-75 by 40.
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