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Solve for A_9
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7A=A_{9}+16
Add 16 to both sides.
\frac{7A}{7}=\frac{A_{9}+16}{7}
Divide both sides by 7.
A=\frac{A_{9}+16}{7}
Dividing by 7 undoes the multiplication by 7.
A_{9}=7A-16
Swap sides so that all variable terms are on the left hand side.