$\frac{10\cdot7-\left(-11\right)}{-3}$
$2x^2-12x+14=3x^2-20x+21$
$9-x<6$
$-16x^2\:+\:16$
$\left(\cot\left(x\right)^2\right)-\left(1-\sin\left(x\right)\right)$
$5-2au+1-u+u$
$\left(5m-3n\right)\left(m^2-mn+n^2\right)$
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