$$49 { a }^{ 2 } { x }^{ 2 } { b }^{ 2 } -25$$
$\left(7abx-5\right)\left(7abx+5\right)$
$$\left(7axb-5\right)\left(7axb+5\right)$$
$$\left(7abx-5\right)\left(7abx+5\right)$$
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$49\left(abx\right)^{2}-25$
