$$\frac { 12 x ^ { 2 } - 30 x y } { 30 x ^ { 2 } - 12 x y }$$
$\frac{2x-5y}{5x-2y}$
$$\frac{6x\left(2x-5y\right)}{6x\left(5x-2y\right)}$$
$$\frac{2x-5y}{5x-2y}$$
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$\frac{5y-2x}{2y-5x}$
