$\lim_{x\to2}\frac{-\left(x^2-4\right)}{x-2}$
$10^4-8x+7$
$\frac{4m^2-9n^4}{2m-3m^2}$
$-41.1\:+\:22,1$
$-\frac{76}{19}$
$5+\left(\:-8\:\right)\left(-3\right)\:$
$\left(x+y\right)dx+\left(y-x\right)dy$
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