Solve for x
x=\frac{C-900}{15}
Solve for C
C=15\left(x+60\right)
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15x+900=C
Swap sides so that all variable terms are on the left hand side.
15x=C-900
Subtract 900 from both sides.
\frac{15x}{15}=\frac{C-900}{15}
Divide both sides by 15.
x=\frac{C-900}{15}
Dividing by 15 undoes the multiplication by 15.
x=\frac{C}{15}-60
Divide C-900 by 15.
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