$\left(-9x+1\right)\left(-9x-1\right)$
$x-12=-4$
$k^2-13k\:+40$
$\lim_{x\to\infty}\left(\frac{x^2}{e^xlnx}\right)$
$-4x^2-5x+8$
$2x^3+128$
$\left(\frac{15a}{7}+4b\right)\left(\frac{15a}{7}-4b\right)$
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