Solve for c
c=\frac{A+3d}{2}
Solve for A
A=2c-3d
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2c-3d=A
Swap sides so that all variable terms are on the left hand side.
2c=A+3d
Add 3d to both sides.
\frac{2c}{2}=\frac{A+3d}{2}
Divide both sides by 2.
c=\frac{A+3d}{2}
Dividing by 2 undoes the multiplication by 2.
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