Solve for a
a=\frac{G+12b-24}{18}
Solve for G
G=18a-12b+24
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18a-12b+24=G
Swap sides so that all variable terms are on the left hand side.
18a+24=G+12b
Add 12b to both sides.
18a=G+12b-24
Subtract 24 from both sides.
\frac{18a}{18}=\frac{G+12b-24}{18}
Divide both sides by 18.
a=\frac{G+12b-24}{18}
Dividing by 18 undoes the multiplication by 18.
a=\frac{G}{18}+\frac{2b}{3}-\frac{4}{3}
Divide G+12b-24 by 18.
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