$\left(27-12\right)-\left(-36+4-30\right)$
$5.\left(-3-8\right).8\left(-15:5\right)-\left(-\left(9-7\right)-\left(-2-5+6.\left(-3\right)\right)\right)$
$y^2-3y+1$
$\frac{4}{3}+2\le3$
$x+2+x-6-x-4x$
$\sqrt{x-2}\cdot\sqrt{x-2}$
$\int_{-2}^2\left(\frac{1}{\left(x+5\right)\left(x^2+9\right)}\right)dx$
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