$\lim_{x\to2}\left(x^3-x^2-4\right)$
$75a^{3}b-98ab^{3}$
$5m^2n;\:m=3;\:n=\frac{1}{3}$
$-9+-2+-4\cdot6$
$\left(2b^2\right)^3$
$\left(b+8\right)\left(b-9\right)$
$2x\:+\:\frac{1}{3}\:\le2\:-\:3x$
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