$-70+30-9+10+15-25$
$\sqrt{1-x}^3$
$\lim_{x\to3}\left(x-5\right)$
$\left(-\frac{4}{5}xyz^2\right)\left(\frac{3}{4}x^2yz^3\right)$
$225y^2-25$
$\lim_{x\to2}\left(\frac{1-\cos\left(6x\right)}{2x}\right)$
$\left(2x-4\right)-9$
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