$\int\frac{-2}{x}dx$
$-19+\left(-9.12+8\right):\left(-8+33\right)$
$\int\left(x^3+7x-1\right)\left(9x^2+21\right)dx$
$-8x+7<31$
$2x-3\le4x+7$
$x^2\cdot\frac{1}{x}=x^2\cdot\frac{6}{x^2}$
$\sqrt[4]{\left(-3\right)^4^2}$
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