Solve for y
y=\frac{3-x}{10}
Solve for x
x=3-10y
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10y=3-x
Subtract x from both sides.
\frac{10y}{10}=\frac{3-x}{10}
Divide both sides by 10.
y=\frac{3-x}{10}
Dividing by 10 undoes the multiplication by 10.
x=3-10y
Subtract 10y from both sides.
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