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5x=45-9y
Subtract 9y from both sides.
\frac{5x}{5}=\frac{45-9y}{5}
Divide both sides by 5.
x=\frac{45-9y}{5}
Dividing by 5 undoes the multiplication by 5.
x=-\frac{9y}{5}+9
Divide 45-9y by 5.
9y=45-5x
Subtract 5x from both sides.
\frac{9y}{9}=\frac{45-5x}{9}
Divide both sides by 9.
y=\frac{45-5x}{9}
Dividing by 9 undoes the multiplication by 9.
y=-\frac{5x}{9}+5
Divide 45-5x by 9.