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10x=30.5-10y
Subtract 10y from both sides.
\frac{10x}{10}=\frac{30.5-10y}{10}
Divide both sides by 10.
x=\frac{30.5-10y}{10}
Dividing by 10 undoes the multiplication by 10.
x=\frac{61}{20}-y
Divide 30.5-10y by 10.
10y=30.5-10x
Subtract 10x from both sides.
\frac{10y}{10}=\frac{30.5-10x}{10}
Divide both sides by 10.
y=\frac{30.5-10x}{10}
Dividing by 10 undoes the multiplication by 10.
y=\frac{61}{20}-x
Divide 30.5-10x by 10.