$x^2-0.5x-1.5=0$
$3x-y=7$
$x^5+x^4+x^2+x$
$-8x-8y=-64$
$\lim_{x\to-2}\left(\frac{1}{x+2}-\frac{1}{x^2-4}\right)$
$25x^2+100x=0$
$675<x-35$
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