$\left(-13^2\right)-4\left(-90\right)$
$\left(-3\right)-\left(+6\right)+\left(+4\right)-\left|\left(-2\right)+\left(-8\right)\right|$
$\lim_{x\to1}\left(x^3-3x^2-2x-1\right)$
$\frac{4x^5-3x^2+x-+1}{2x^3-1}$
$u^2-2u-4$
$\frac{x}{2}+\frac{x+1}{7}-x+2<\:0$
$\log_b\left(y^2x\right)$
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