$\left(mna+1\right)\left(mna-1\right)$
$2x\left(x-3\right)\le1$
$\left(-2x\right)+3+\left(-x\right)+2$
$\int\frac{-11x-82}{6x^2-13x-28}dx$
$5n-4=21$
$12-8-20+3-6-7-9+4-20-23$
$\lim_{x\to0}\left(\frac{\left(2e^{2x}-2\right)^3}{3e^2x^2}\right)$
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