Multiple choice question I — task. Mathematics State Board, Class 10.

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$\frac{3 y - 3}{y} \div \frac{7 y - 7}{{3 y}^{2}}$ is

$\frac{{9 y}^{3}}{(21 y - 21)}$
$\frac{7 (y^{2} - 2 y + 1)}{y^{2}}$
$\frac{9 y}{7}$
$\frac{{21 y}^{2} - 42 y + 21}{{3 y}^{3}}$

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