$5-7+19-\left(20+4-8\right)+10$
$\int\left(\frac{x^{11}\cos\left(x\right)}{x}\right)dx$
$\frac{9-x^2}{x+2}$
$36x^2-84+4$
$\frac{3x^4+x+1}{x^2}$
$3x+2<1-6x$
$+\left(12:\left(-2\right)\cdot3\right)\cdot4^2$
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