$\frac{36x^4-109x^2+25}{x-3}$
$\int\left(9e^{11-3x}\right)dx$
$99+-2$
$-5x^2+22x-8$
$\left(3x^{2a}-12y^{m+1}\right)\left(3x^{2n}+12y^{m-1}\right)$
$\lim_{x\to6}\frac{x^2-11x+30}{x^2-13x+42}$
$a2\:-\:1$
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