Solve for a
a=\frac{-A-11}{7}
Solve for A
A=-7a-11
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-7a-11=A
Swap sides so that all variable terms are on the left hand side.
-7a=A+11
Add 11 to both sides.
\frac{-7a}{-7}=\frac{A+11}{-7}
Divide both sides by -7.
a=\frac{A+11}{-7}
Dividing by -7 undoes the multiplication by -7.
a=\frac{-A-11}{7}
Divide A+11 by -7.
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