$ac+ca$
$\lim_{x\to2}\left(\frac{\left(x+2\right)\sin\left(x-2\right)}{2x-4}\right)$
$26\cdot50$
$-72=90+x$
$\frac{-24x^{20}y^{16}}{4a^2b^{10}}$
$3x^2-4x-6;\:x=-2$
$-\frac{2400}{-40}$
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