$-x-4x+21<0$
$\int4x^2\sqrt{1-3x^3}dx$
$n^2<4n-3$
$\left(3+g^3\right)\left(3-g^3\right)$
$\int_1^2\left(xe^{-x}\right)dx$
$\int\:\sqrt{x}\left(x^2-2\right)dx$
$\left(1-2a\right)\left\{2a+1\right\}$
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