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3y-9=y-9
Use the distributive property to multiply 3 by y-3.
3y-9-y=-9
Subtract y from both sides.
2y-9=-9
Combine 3y and -y to get 2y.
2y=-9+9
Add 9 to both sides.
2y=0
Add -9 and 9 to get 0.
y=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 2 is not equal to 0, y must be equal to 0.