$a^2+ab+7a^2+8ab-3ab-6a^2+11a^2$
$81-100n^2$
$\left(10-x\right)z'=10z$
$\lim_{x\to0}\left(\frac{sin\:x^2}{x\:tan\:x}\right)$
$\left(x+5\right)\left(x+2\right)\left(x+1\right)\left(x-2\right)$
$4a^4-12a^2+9$
$5m+6m=22$
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