$k^2-7k-30$
$y^2.7y+12$
$\left(7x+9\right)\left(7x-9\right)^2$
$\lim_{x\to0}\frac{x^2}{e^x-1}$
$23.25-24+2$
$\left(n-6\right)\left(n+6\right)$
$\left(3x-5y+8x\right)^2$
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