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-7x=-20-3y
Subtract 3y from both sides.
-7x=-3y-20
The equation is in standard form.
\frac{-7x}{-7}=\frac{-3y-20}{-7}
Divide both sides by -7.
x=\frac{-3y-20}{-7}
Dividing by -7 undoes the multiplication by -7.
x=\frac{3y+20}{7}
Divide -20-3y by -7.