$\frac{12x^3}{x-3}$
$6x^2+9^2+x^3$
$5b\:.\:5a\:.\:5ab$
$\frac{4}{3x+2},c=5$
$\frac{\left(x-4\right)^2}{x^5-64x^2y^3}$
$\lim_{x\to1}\frac{\left|x-1\right|}{x^2-1}$
$50+9+27+40$
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