$6a^2-5a-6$
$2.25\cdot10^5+1.15\cdot10^2-3.25\cdot10^3$
$3\left(3x^2-2x'\right)$
$21-1,026$
$\left(a-9\right)\left(a-2\right)$
$\left(10-w\right)\left(10+w\right)$
$\sqrt{a}+4\sqrt{a}$
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