$xy-8x=1$
$2x+y;\:x=7;\:y=104$
$10-7w-13-7w$
$32mn^2,12m^2n^228mn$
$x^2-4x-1=0$
$14x=14$
$\lim_{x\to5}\left(\frac{\sqrt{x+25}-5}{x-5}\right)$
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