Solve for a
a=-\frac{A}{7}
Solve for A
A=-7a
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A=-7a
Combine 6a and -13a to get -7a.
-7a=A
Swap sides so that all variable terms are on the left hand side.
\frac{-7a}{-7}=\frac{A}{-7}
Divide both sides by -7.
a=\frac{A}{-7}
Dividing by -7 undoes the multiplication by -7.
a=-\frac{A}{7}
Divide A by -7.
A=-7a
Combine 6a and -13a to get -7a.
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