$$7 x ^ { 2 } - 12 x ^ { 2 } + 18 + 12$$
$30-5x^{2}$
$$-5x^{2}+18+12$$
$$-5x^{2}+30$$
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$5\left(6-x^{2}\right)$
$$5\left(-x^{2}+6\right)$$
