Solve for x
x=\frac{7\pi -y}{3}
Solve for y
y=7\pi -3x
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3x=7\pi -y
Subtract y from both sides.
\frac{3x}{3}=\frac{7\pi -y}{3}
Divide both sides by 3.
x=\frac{7\pi -y}{3}
Dividing by 3 undoes the multiplication by 3.
y=7\pi -3x
Subtract 3x from both sides.
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