$-y^4\:+\:20y^3\:-132y^2\:+369y\:-378$
$13n-26$
$t+4+3-2t$
$17=9w-1$
$0+4cos\left(\pi\right)\sin\left(\frac{\pi}{8}\right)$
$\lim_{x\to-2}\left(\frac{2-\sqrt{6x+16}}{4x^2-9e^2-7}\right)$
$\left(7x^2+3y^3\right)\left(7x^2-3y^3\right)$
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