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Solve for y
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Solve for D
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-y=9-D
Subtract D from both sides.
\frac{-y}{-1}=\frac{9-D}{-1}
Divide both sides by -1.
y=\frac{9-D}{-1}
Dividing by -1 undoes the multiplication by -1.
y=D-9
Divide 9-D by -1.
D=9+y
Add y to both sides.