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(3y-3)/(y)÷(7y-7)/(3y^(2)) is...

`(3y-3)/(y)÷(7y-7)/(3y^(2))` is

A

`(9y)/7`

B

`(9y^3)/((21y-21))`

C

`(21y^2 - 42y+21)/(3y^3)`

D

`(7(y^2-2y+1))/(y^2)`

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