Solve for a
a=3
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9a-63=-36
Swap sides so that all variable terms are on the left hand side.
9a=-36+63
Add 63 to both sides.
9a=27
Add -36 and 63 to get 27.
a=\frac{27}{9}
Divide both sides by 9.
a=3
Divide 27 by 9 to get 3.
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