Solve for A
A=107-A_{9}
Solve for A_9
A_{9}=107-A
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1A=107-A_{9}
Swap sides so that all variable terms are on the left hand side.
A=-A_{9}+107
Reorder the terms.
-A_{9}=1A-107
Subtract 107 from both sides.
-A_{9}=A-107
Reorder the terms.
\frac{-A_{9}}{-1}=\frac{A-107}{-1}
Divide both sides by -1.
A_{9}=\frac{A-107}{-1}
Dividing by -1 undoes the multiplication by -1.
A_{9}=107-A
Divide A-107 by -1.
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