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-9x=-15-3y
Subtract 3y from both sides.
-9x=-3y-15
The equation is in standard form.
\frac{-9x}{-9}=\frac{-3y-15}{-9}
Divide both sides by -9.
x=\frac{-3y-15}{-9}
Dividing by -9 undoes the multiplication by -9.
x=\frac{y+5}{3}
Divide -15-3y by -9.
3y=-15+9x
Add 9x to both sides.
3y=9x-15
The equation is in standard form.
\frac{3y}{3}=\frac{9x-15}{3}
Divide both sides by 3.
y=\frac{9x-15}{3}
Dividing by 3 undoes the multiplication by 3.
y=3x-5
Divide -15+9x by 3.