$-4\left(5c-2\right)-9$
$\lim_{x\to0}\:\left(\sqrt{2z+3}\right)$
$3u-4-1+1-4uy$
$\frac{4a^2+9b^2}{10a^2-15ab}$
$\left(6a+b\right)\left(5c-4\right)$
$100c^2-180+81$
$4x^2+9y^2+z^2-8x-36y+36=0$
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