Solve for A
A=\frac{A_{0}-Uh_{k}}{2}
Solve for A_0
A_{0}=2A+Uh_{k}
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2A+Uh_{k}=A_{0}
Swap sides so that all variable terms are on the left hand side.
2A=A_{0}-Uh_{k}
Subtract Uh_{k} from both sides.
\frac{2A}{2}=\frac{A_{0}-Uh_{k}}{2}
Divide both sides by 2.
A=\frac{A_{0}-Uh_{k}}{2}
Dividing by 2 undoes the multiplication by 2.
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