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2x-9=2y
Multiply both sides of the equation by 6, the least common multiple of 6,3.
2x=2y+9
Add 9 to both sides.
\frac{2x}{2}=\frac{2y+9}{2}
Divide both sides by 2.
x=\frac{2y+9}{2}
Dividing by 2 undoes the multiplication by 2.
x=y+\frac{9}{2}
Divide 2y+9 by 2.
2x-9=2y
Multiply both sides of the equation by 6, the least common multiple of 6,3.
2y=2x-9
Swap sides so that all variable terms are on the left hand side.
\frac{2y}{2}=\frac{2x-9}{2}
Divide both sides by 2.
y=\frac{2x-9}{2}
Dividing by 2 undoes the multiplication by 2.
y=x-\frac{9}{2}
Divide 2x-9 by 2.