$-4-2-6-1$
$\left(x^2+3xb\right)\left(6b^2+2xb\right)$
$b+3b>28$
$\frac{x^2+3x}{2}=44$
$\left(4x^2y\:-\:2z^2\right)^2$
$-2\sqrt{\left(-2\right)^2+5}$
$\lim_{x\to e}\left(\frac{3ln90}{x^2}\right)$
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