Solve for x
x=\frac{20-7y}{9}
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9x=20-7y
Subtract 7y from both sides.
\frac{9x}{9}=\frac{20-7y}{9}
Divide both sides by 9.
x=\frac{20-7y}{9}
Dividing by 9 undoes the multiplication by 9.
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