$2x-4\le0$
$-7+9-2-2+9-9+6$
$x^4m+x^5+3yx$
$\lim_{x\to-7}\left(\frac{t^2+4t-21}{t+\:7}\right)$
$2ydx\:+3xdy=0$
$2cos\left(2x\right)-2cos^2\left(x\right)=-1$
$x2-2x-15=0$
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