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9x=45+5y
Add 5y to both sides.
9x=5y+45
The equation is in standard form.
\frac{9x}{9}=\frac{5y+45}{9}
Divide both sides by 9.
x=\frac{5y+45}{9}
Dividing by 9 undoes the multiplication by 9.
x=\frac{5y}{9}+5
Divide 45+5y by 9.
-5y=45-9x
Subtract 9x from both sides.
\frac{-5y}{-5}=\frac{45-9x}{-5}
Divide both sides by -5.
y=\frac{45-9x}{-5}
Dividing by -5 undoes the multiplication by -5.
y=\frac{9x}{5}-9
Divide 45-9x by -5.