$$2X7-\frac{10}{9-4}$$
$2\left(X_{7}-1\right)$
$$2X_{7}-\frac{10}{5}$$
$$2X_{7}-2$$
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$$factor(2X_{7}-\frac{10}{5})$$
$$factor(2X_{7}-2)$$
$$2\left(X_{7}-1\right)$$