$\left(2+m^2-4m\right)+\left(m-2\right)$
$-12x^2-21x-58$
$32.45\cdot2$
$\left[-8+\left(4\cdot6\right)\right]+9-\left(\frac{10}{5}\right)$
$\frac{21x^5-21y^5}{3x^2+2y^2}$
$\sqrt{a^2}\cdot b^2\cdot\sqrt{a^4}\cdot b$
$7x-11\le4x$
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