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C=-15x-25
Use the distributive property to multiply -5 by 3x+5.
-15x-25=C
Swap sides so that all variable terms are on the left hand side.
-15x=C+25
Add 25 to both sides.
\frac{-15x}{-15}=\frac{C+25}{-15}
Divide both sides by -15.
x=\frac{C+25}{-15}
Dividing by -15 undoes the multiplication by -15.
x=-\frac{C}{15}-\frac{5}{3}
Divide C+25 by -15.
C=-15x-25
Use the distributive property to multiply -5 by 3x+5.