$\frac{-4x^2+16}{6x^2-2x-20}$
$a+a-8a$
$121\:k^8\:y^2^2$
$3^3.3^4.3$
$\lim_{x\to-2}\left(\frac{x^2-x+a}{x^2+3x+b}\right)$
$\left(\left(x-2y\right)+7z\right)^2$
$16+40x$
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