Solve for y
y=\frac{C-10}{25}
Solve for C
C=25y+10
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25y+10=C
Swap sides so that all variable terms are on the left hand side.
25y=C-10
Subtract 10 from both sides.
\frac{25y}{25}=\frac{C-10}{25}
Divide both sides by 25.
y=\frac{C-10}{25}
Dividing by 25 undoes the multiplication by 25.
y=\frac{C}{25}-\frac{2}{5}
Divide C-10 by 25.
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