$x^9-x^6$
$\left(-11b+10\right)\left(-11b-10\right)$
$91-\left(-69\right)$
$\frac{3^3+x-11}{x+1}$
$\left(2x+1\right)+\left(2x+4\right)$
$3x^2+x^2+x\:$
$\lim_{x\to0}\left(\frac{\sin\:\left(2x\right)^4}{4x^4}\right)$
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