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