$\left(-8m+4\right)-\left(m-9\right)$
$y\:=\:2x\sqrt{\frac{t+x}{t-x}}$
$xdx+ye^{-x}dy=0$
$-84ab-16ab$
$-350+130-45+\left(-92\right)$
$2x^2-8x-24\le0$
$\lim_{x\to0}\left(\frac{2x^3-8x+5}{9x^3+5}\right)$
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