$\left(-25\right)-\left(-21\right)$
$1\:+\:-7\:+\:9$
$\frac{d}{dx}\frac{3}{2\sqrt{t}}+\frac{3}{t^{\frac{2}{3}}}$
$-\frac{42}{3}$
$10x\le-9$
$x^2-x+1+x+1$
$4\left(1x+6\right)-6\left(8-2x\right)$
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