$$18 { x }^{ 2 } -9 { y }^{ 2 } -13 { y }^{ 2 } -6 { x }^{ 2 }$$
$12x^{2}-22y^{2}$
$$18x^{2}-22y^{2}-6x^{2}$$
$$12x^{2}-22y^{2}$$
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$2\left(6x^{2}-11y^{2}\right)$
$$2\left(6x^{2}-11y^{2}\right)$$
